Fix typos found by codespell (#650)

.github/workflows/e2e-cache.yml

@@ -43,22 +43,30 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Setup Python
+        id: cache-pipenv
         uses: ./
         with:
           python-version: ${{ matrix.python-version }}
           cache: 'pipenv'
       - name: Install pipenv
         run: curl https://raw.githubusercontent.com/pypa/pipenv/master/get-pipenv.py | python
-      - name: Install dependencies
+      - name: Prepare environment
         shell: pwsh
         run: |
           mv ./__tests__/data/Pipfile.lock .
           mv ./__tests__/data/Pipfile .
+          mv ./__tests__/test-pipenv.py .
+      - name: Install dependencies
+        shell: pwsh
+        if: steps.cache-pipenv.outputs.cache-hit != 'true'
+        run: |
           if ("${{ matrix.python-version }}" -Match "pypy") {
-            pipenv install --keep-outdated --python pypy
+            pipenv install --python pypy # --keep-outdated
           } else {
-            pipenv install --keep-outdated --python ${{ matrix.python-version }}
+            pipenv install --python ${{ matrix.python-version }} # --keep-outdated
           }
+      - name: Run Python Script
+        run: pipenv run python test-pipenv.py
 
   python-poetry-dependencies-caching:
     name: Test poetry (Python ${{ matrix.python-version}}, ${{ matrix.os }})
@@ -112,6 +120,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Setup Python
+        id: cache-pipenv
         uses: ./
         with:
           python-version: ${{ matrix.python-version }}
@@ -119,13 +128,20 @@ jobs:
           cache-dependency-path: '**/pipenv-requirements.txt'
       - name: Install pipenv
         run: curl https://raw.githubusercontent.com/pypa/pipenv/master/get-pipenv.py | python
-      - name: Install dependencies
+      - name: Prepare environment
         shell: pwsh
         run: |
           mv ./__tests__/data/Pipfile.lock .
           mv ./__tests__/data/Pipfile .
+          mv ./__tests__/test-pipenv.py .
+      - name: Install dependencies
+        shell: pwsh
+        if: steps.cache-pipenv.outputs.cache-hit != 'true'
+        run: |
           if ("${{ matrix.python-version }}" -Match "pypy") {
-            pipenv install --keep-outdated --python pypy
+            pipenv install --python pypy # --keep-outdated
           } else {
-            pipenv install --keep-outdated --python ${{ matrix.python-version }}
+            pipenv install --python ${{ matrix.python-version }} # --keep-outdated
           }
+      - name: Run Python Script
+        run: pipenv run python test-pipenv.py

.github/workflows/e2e-tests.yml

@@ -21,13 +21,6 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v3
 
-      - name: Run with setup-python 2.7
-        uses: ./
-        with:
-          python-version: 2.7
-      - name: Verify 2.7
-        run: python __tests__/verify-python.py 2.7
-
       - name: Run with setup-python 3.5
         uses: ./
         with:
@@ -86,3 +79,24 @@ jobs:
         run: python __tests__/verify-python.py 3.10
       - name: Run python-path sample 3.10
         run: pipx run --python '${{ steps.cp310.outputs.python-path }}' nox --version
+
+      - name: Run with setup-python ==3.8
+        uses: ./
+        with:
+          python-version: '==3.8'
+      - name: Verify ==3.8
+        run: python __tests__/verify-python.py 3.8
+
+      - name: Run with setup-python <3.11
+        uses: ./
+        with:
+          python-version: '<3.11'
+      - name: Verify <3.11
+        run: python __tests__/verify-python.py 3.10
+
+      - name: Run with setup-python >3.8
+        uses: ./
+        with:
+          python-version: '>3.8'
+      - name: Verify >3.8
+        run: python __tests__/verify-python.py 3.11

.github/workflows/test-python.yml

@@ -86,7 +86,152 @@ jobs:
         id: setup-python
         uses: ./
         with:
-          python-version-file: '.python-version'
+          python-version-file: .python-version
+
+      - name: Check python-path
+        run: ./__tests__/check-python-path.sh '${{ steps.setup-python.outputs.python-path }}'
+        shell: bash
+
+      - name: Validate version
+        run: |
+          $pythonVersion = (python --version)
+          if ("Python ${{ matrix.python }}" -ne "$pythonVersion"){
+            Write-Host "The current version is $pythonVersion; expected version is ${{ matrix.python }}"
+            exit 1
+          }
+          $pythonVersion
+        shell: pwsh
+
+      - name: Run simple code
+        run: python -c 'import math; print(math.factorial(5))'
+
+  setup-versions-from-file-without-parameter:
+    name: Setup ${{ matrix.python }} ${{ matrix.os }} version file without parameter
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, windows-latest, ubuntu-20.04, ubuntu-22.04]
+        python: [3.5.4, 3.6.7, 3.7.5, 3.8.15, 3.9.13]
+        exclude:
+          - os: ubuntu-22.04
+            python: 3.5.4
+          - os: ubuntu-22.04
+            python: 3.6.7
+          - os: ubuntu-22.04
+            python: 3.7.5
+          - os: windows-latest
+            python: 3.8.15
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: build-version-file ${{ matrix.python }}
+        run: echo ${{ matrix.python }} > .python-version
+
+      - name: setup-python ${{ matrix.python }}
+        id: setup-python
+        uses: ./
+
+      - name: Check python-path
+        run: ./__tests__/check-python-path.sh '${{ steps.setup-python.outputs.python-path }}'
+        shell: bash
+
+      - name: Validate version
+        run: |
+          $pythonVersion = (python --version)
+          if ("Python ${{ matrix.python }}" -ne "$pythonVersion"){
+            Write-Host "The current version is $pythonVersion; expected version is ${{ matrix.python }}"
+            exit 1
+          }
+          $pythonVersion
+        shell: pwsh
+
+      - name: Run simple code
+        run: python -c 'import math; print(math.factorial(5))'
+
+  setup-versions-from-standard-pyproject-file:
+    name: Setup ${{ matrix.python }} ${{ matrix.os }} standard pyproject file
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, windows-latest, ubuntu-20.04, ubuntu-22.04]
+        python: [3.5.4, 3.6.7, 3.7.5, 3.8.15, 3.9.13]
+        exclude:
+          - os: ubuntu-22.04
+            python: 3.5.4
+          - os: ubuntu-22.04
+            python: 3.6.7
+          - os: ubuntu-22.04
+            python: 3.7.5
+          - os: windows-latest
+            python: 3.8.15
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: build-version-file ${{ matrix.python }}
+        run: |
+          echo '[project]
+            requires-python = "${{ matrix.python }}"
+          ' > pyproject.toml
+
+      - name: setup-python ${{ matrix.python }}
+        id: setup-python
+        uses: ./
+        with:
+          python-version-file: pyproject.toml
+
+      - name: Check python-path
+        run: ./__tests__/check-python-path.sh '${{ steps.setup-python.outputs.python-path }}'
+        shell: bash
+
+      - name: Validate version
+        run: |
+          $pythonVersion = (python --version)
+          if ("Python ${{ matrix.python }}" -ne "$pythonVersion"){
+            Write-Host "The current version is $pythonVersion; expected version is ${{ matrix.python }}"
+            exit 1
+          }
+          $pythonVersion
+        shell: pwsh
+
+      - name: Run simple code
+        run: python -c 'import math; print(math.factorial(5))'
+
+  setup-versions-from-poetry-pyproject-file:
+    name: Setup ${{ matrix.python }} ${{ matrix.os }} poetry pyproject file
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, windows-latest, ubuntu-20.04, ubuntu-22.04]
+        python: [3.5.4, 3.6.7, 3.7.5, 3.8.15, 3.9.13]
+        exclude:
+          - os: ubuntu-22.04
+            python: 3.5.4
+          - os: ubuntu-22.04
+            python: 3.6.7
+          - os: ubuntu-22.04
+            python: 3.7.5
+          - os: windows-latest
+            python: 3.8.15
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: build-version-file ${{ matrix.python }}
+        run: |
+          echo '[tool.poetry.dependencies]
+            python = "${{ matrix.python }}"
+          ' > pyproject.toml
+
+      - name: setup-python ${{ matrix.python }}
+        id: setup-python
+        uses: ./
+        with:
+          python-version-file: pyproject.toml
 
       - name: Check python-path
         run: ./__tests__/check-python-path.sh '${{ steps.setup-python.outputs.python-path }}'

__tests__/cache-restore.test.ts

@@ -8,7 +8,7 @@ import {State} from '../src/cache-distributions/cache-distributor';
 
 describe('restore-cache', () => {
   const pipFileLockHash =
-    'a3bdcc71289e4979ca9e051810d81999cc99823109faf6912e17ff14c8e621a6';
+    'f8428d7cf00ea53a5c3702f0a9cb3cc467f76cd86a34723009350c4e4b32751a';
   const requirementsHash =
     'd8110e0006d7fb5ee76365d565eef9d37df1d11598b912d3eb66d398d57a1121';
   const requirementsLinuxHash =

__tests__/data/Pipfile

@@ -4,8 +4,8 @@ verify_ssl = true
 name = "pypi"
 
 [packages]
-flake8 = "==4.0.1"
+flake8 = "==6.0.0"
-numpy = "==1.23.0"
+numpy = "==1.25.1"
 
 [dev-packages]
 

__tests__/data/Pipfile.lock

@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "e9c37110984955621040e2dc8548c026eb8466c23db1b8e69430289b10be8938"
+            "sha256": "dcea65dabfe8442466b5e9280ecab72cfa7bf555791ee0ad55b6e7255dca1f43"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -18,62 +18,66 @@
     "default": {
         "flake8": {
             "hashes": [
-                "sha256:479b1304f72536a55948cb40a32dce8bb0ffe3501e26eaf292c7e60eb5e0428d",
+                "sha256:3833794e27ff64ea4e9cf5d410082a8b97ff1a06c16aa3d2027339cd0f1195c7",
-                "sha256:806e034dda44114815e23c16ef92f95c91e4c71100ff52813adf7132a6ad870d"
+                "sha256:c61007e76655af75e6785a931f452915b371dc48f56efd765247c8fe68f2b181"
             ],
             "index": "pypi",
-            "version": "==4.0.1"
+            "version": "==6.0.0"
         },
         "mccabe": {
             "hashes": [
-                "sha256:ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42",
+                "sha256:348e0240c33b60bbdf4e523192ef919f28cb2c3d7d5c7794f74009290f236325",
-                "sha256:dd8d182285a0fe56bace7f45b5e7d1a6ebcbf524e8f3bd87eb0f125271b8831f"
+                "sha256:6c2d30ab6be0e4a46919781807b4f0d834ebdd6c6e3dca0bda5a15f863427b6e"
             ],
-            "version": "==0.6.1"
+            "markers": "python_version >= '3.6'",
+            "version": "==0.7.0"
         },
         "numpy": {
             "hashes": [
-                "sha256:092f5e6025813e64ad6d1b52b519165d08c730d099c114a9247c9bb635a2a450",
+                "sha256:012097b5b0d00a11070e8f2e261128c44157a8689f7dedcf35576e525893f4fe",
-                "sha256:196cd074c3f97c4121601790955f915187736f9cf458d3ee1f1b46aff2b1ade0",
+                "sha256:0d3fe3dd0506a28493d82dc3cf254be8cd0d26f4008a417385cbf1ae95b54004",
-                "sha256:1c29b44905af288b3919803aceb6ec7fec77406d8b08aaa2e8b9e63d0fe2f160",
+                "sha256:0def91f8af6ec4bb94c370e38c575855bf1d0be8a8fbfba42ef9c073faf2cf19",
-                "sha256:2b2da66582f3a69c8ce25ed7921dcd8010d05e59ac8d89d126a299be60421171",
+                "sha256:1a180429394f81c7933634ae49b37b472d343cccb5bb0c4a575ac8bbc433722f",
-                "sha256:5043bcd71fcc458dfb8a0fc5509bbc979da0131b9d08e3d5f50fb0bbb36f169a",
+                "sha256:1d5d3c68e443c90b38fdf8ef40e60e2538a27548b39b12b73132456847f4b631",
-                "sha256:58bfd40eb478f54ff7a5710dd61c8097e169bc36cc68333d00a9bcd8def53b38",
+                "sha256:20e1266411120a4f16fad8efa8e0454d21d00b8c7cee5b5ccad7565d95eb42dd",
-                "sha256:79a506cacf2be3a74ead5467aee97b81fca00c9c4c8b3ba16dbab488cd99ba10",
+                "sha256:247d3ffdd7775bdf191f848be8d49100495114c82c2bd134e8d5d075fb386a1c",
-                "sha256:94b170b4fa0168cd6be4becf37cb5b127bd12a795123984385b8cd4aca9857e5",
+                "sha256:35a9527c977b924042170a0887de727cd84ff179e478481404c5dc66b4170009",
-                "sha256:97a76604d9b0e79f59baeca16593c711fddb44936e40310f78bfef79ee9a835f",
+                "sha256:38eb6548bb91c421261b4805dc44def9ca1a6eef6444ce35ad1669c0f1a3fc5d",
-                "sha256:98e8e0d8d69ff4d3fa63e6c61e8cfe2d03c29b16b58dbef1f9baa175bbed7860",
+                "sha256:3d7abcdd85aea3e6cdddb59af2350c7ab1ed764397f8eec97a038ad244d2d105",
-                "sha256:ac86f407873b952679f5f9e6c0612687e51547af0e14ddea1eedfcb22466babd",
+                "sha256:41a56b70e8139884eccb2f733c2f7378af06c82304959e174f8e7370af112e09",
-                "sha256:ae8adff4172692ce56233db04b7ce5792186f179c415c37d539c25de7298d25d",
+                "sha256:4a90725800caeaa160732d6b31f3f843ebd45d6b5f3eec9e8cc287e30f2805bf",
-                "sha256:bd3fa4fe2e38533d5336e1272fc4e765cabbbde144309ccee8675509d5cd7b05",
+                "sha256:6b82655dd8efeea69dbf85d00fca40013d7f503212bc5259056244961268b66e",
-                "sha256:d0d2094e8f4d760500394d77b383a1b06d3663e8892cdf5df3c592f55f3bff66",
+                "sha256:6c6c9261d21e617c6dc5eacba35cb68ec36bb72adcff0dee63f8fbc899362588",
-                "sha256:d54b3b828d618a19779a84c3ad952e96e2c2311b16384e973e671aa5be1f6187",
+                "sha256:77d339465dff3eb33c701430bcb9c325b60354698340229e1dff97745e6b3efa",
-                "sha256:d6ca8dabe696c2785d0c8c9b0d8a9b6e5fdbe4f922bde70d57fa1a2848134f95",
+                "sha256:791f409064d0a69dd20579345d852c59822c6aa087f23b07b1b4e28ff5880fcb",
-                "sha256:d8cc87bed09de55477dba9da370c1679bd534df9baa171dd01accbb09687dac3",
+                "sha256:9a3a9f3a61480cc086117b426a8bd86869c213fc4072e606f01c4e4b66eb92bf",
-                "sha256:f0f18804df7370571fb65db9b98bf1378172bd4e962482b857e612d1fec0f53e",
+                "sha256:c1516db588987450b85595586605742879e50dcce923e8973f79529651545b57",
-                "sha256:f1d88ef79e0a7fa631bb2c3dda1ea46b32b1fe614e10fedd611d3d5398447f2f",
+                "sha256:c40571fe966393b212689aa17e32ed905924120737194b5d5c1b20b9ed0fb171",
-                "sha256:f9c3fc2adf67762c9fe1849c859942d23f8d3e0bee7b5ed3d4a9c3eeb50a2f07",
+                "sha256:d412c1697c3853c6fc3cb9751b4915859c7afe6a277c2bf00acf287d56c4e625",
-                "sha256:fc431493df245f3c627c0c05c2bd134535e7929dbe2e602b80e42bf52ff760bc",
+                "sha256:d5154b1a25ec796b1aee12ac1b22f414f94752c5f94832f14d8d6c9ac40bcca6",
-                "sha256:fe8b9683eb26d2c4d5db32cd29b38fdcf8381324ab48313b5b69088e0e355379"
+                "sha256:d736b75c3f2cb96843a5c7f8d8ccc414768d34b0a75f466c05f3a739b406f10b",
+                "sha256:e8f6049c4878cb16960fbbfb22105e49d13d752d4d8371b55110941fb3b17800",
+                "sha256:f76aebc3358ade9eacf9bc2bb8ae589863a4f911611694103af05346637df1b7",
+                "sha256:fd67b306320dcadea700a8f79b9e671e607f8696e98ec255915c0c6d6b818503"
             ],
             "index": "pypi",
-            "version": "==1.23.0"
+            "version": "==1.25.1"
         },
         "pycodestyle": {
             "hashes": [
-                "sha256:720f8b39dde8b293825e7ff02c475f3077124006db4f440dcbc9a20b76548a20",
+                "sha256:347187bdb476329d98f695c213d7295a846d1152ff4fe9bacb8a9590b8ee7053",
-                "sha256:eddd5847ef438ea1c7870ca7eb78a9d47ce0cdb4851a5523949f2601d0cbbe7f"
+                "sha256:8a4eaf0d0495c7395bdab3589ac2db602797d76207242c17d470186815706610"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "markers": "python_version >= '3.6'",
-            "version": "==2.8.0"
+            "version": "==2.10.0"
         },
         "pyflakes": {
             "hashes": [
-                "sha256:05a85c2872edf37a4ed30b0cce2f6093e1d0581f8c19d7393122da7e25b2b24c",
+                "sha256:ec55bf7fe21fff7f1ad2f7da62363d749e2a470500eab1b555334b67aa1ef8cf",
-                "sha256:3bb3a3f256f4b7968c9c788781e4ff07dce46bdf12339dcda61053375426ee2e"
+                "sha256:ec8b276a6b60bd80defed25add7e439881c19e64850afd9b346283d4165fd0fd"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "markers": "python_version >= '3.6'",
-            "version": "==2.4.0"
+            "version": "==3.0.1"
         }
     },
     "develop": {}

__tests__/data/pipenv-requirements.txt

@@ -1,2 +1,2 @@
 numpy==1.22.3
-pandas==1.4.2
+flake8==6.0.0

__tests__/test-pipenv.py

@@ -0,0 +1,7 @@
+import numpy as np
+
+a = np.array([2, 3, 4])
+print(type(a))
+
+b = np.array([1.2, 3.5, 5.1])
+print(type(b))

__tests__/utils.test.ts

@@ -1,9 +1,17 @@
 import * as cache from '@actions/cache';
 import * as core from '@actions/core';
+import * as io from '@actions/io';
+
+import fs from 'fs';
+import path from 'path';
+
 import {
   validateVersion,
   validatePythonVersionFormatForPyPy,
-  isCacheFeatureAvailable
+  isCacheFeatureAvailable,
+  getVersionInputFromFile,
+  getVersionInputFromPlainFile,
+  getVersionInputFromTomlFile
 } from '../src/utils';
 
 jest.mock('@actions/cache');
@@ -73,3 +81,58 @@ describe('isCacheFeatureAvailable', () => {
     expect(isCacheFeatureAvailable()).toBe(true);
   });
 });
+
+const tempDir = path.join(
+  __dirname,
+  'runner',
+  path.join(Math.random().toString(36).substring(7)),
+  'temp'
+);
+
+describe('Version from file test', () => {
+  it.each([getVersionInputFromPlainFile, getVersionInputFromFile])(
+    'Version from plain file test',
+    async _fn => {
+      await io.mkdirP(tempDir);
+      const pythonVersionFileName = 'python-version.file';
+      const pythonVersionFilePath = path.join(tempDir, pythonVersionFileName);
+      const pythonVersionFileContent = '3.7';
+      fs.writeFileSync(pythonVersionFilePath, pythonVersionFileContent);
+      expect(_fn(pythonVersionFilePath)).toEqual([pythonVersionFileContent]);
+    }
+  );
+  it.each([getVersionInputFromTomlFile, getVersionInputFromFile])(
+    'Version from standard pyproject.toml test',
+    async _fn => {
+      await io.mkdirP(tempDir);
+      const pythonVersionFileName = 'pyproject.toml';
+      const pythonVersionFilePath = path.join(tempDir, pythonVersionFileName);
+      const pythonVersion = '>=3.7';
+      const pythonVersionFileContent = `[project]\nrequires-python = "${pythonVersion}"`;
+      fs.writeFileSync(pythonVersionFilePath, pythonVersionFileContent);
+      expect(_fn(pythonVersionFilePath)).toEqual([pythonVersion]);
+    }
+  );
+  it.each([getVersionInputFromTomlFile, getVersionInputFromFile])(
+    'Version from poetry pyproject.toml test',
+    async _fn => {
+      await io.mkdirP(tempDir);
+      const pythonVersionFileName = 'pyproject.toml';
+      const pythonVersionFilePath = path.join(tempDir, pythonVersionFileName);
+      const pythonVersion = '>=3.7';
+      const pythonVersionFileContent = `[tool.poetry.dependencies]\npython = "${pythonVersion}"`;
+      fs.writeFileSync(pythonVersionFilePath, pythonVersionFileContent);
+      expect(_fn(pythonVersionFilePath)).toEqual([pythonVersion]);
+    }
+  );
+  it.each([getVersionInputFromTomlFile, getVersionInputFromFile])(
+    'Version undefined',
+    async _fn => {
+      await io.mkdirP(tempDir);
+      const pythonVersionFileName = 'pyproject.toml';
+      const pythonVersionFilePath = path.join(tempDir, pythonVersionFileName);
+      fs.writeFileSync(pythonVersionFilePath, ``);
+      expect(_fn(pythonVersionFilePath)).toEqual([]);
+    }
+  );
+});

docs/advanced-usage.md

@@ -78,6 +78,17 @@ steps:
 
 You can also use several types of ranges that are specified in [semver](https://github.com/npm/node-semver#ranges), for instance:
 
+- **[ranges](https://github.com/npm/node-semver#ranges)** to download and set up the latest available version of Python satisfying a range:
+
+```yaml
+steps:
+- uses: actions/checkout@v3
+- uses: actions/setup-python@v4
+  with:
+    python-version: '>=3.9 <3.10'
+- run: python my_script.py
+```
+
 - **[hyphen ranges](https://github.com/npm/node-semver#hyphen-ranges-xyz---abc)** to download and set up the latest available version of Python (includes both pre-release and stable versions):
 
 ```yaml
@@ -251,6 +262,16 @@ steps:
     python-version-file: '.python-version' # Read python version from a file .python-version
 - run: python my_script.py
 ```
+
+```yaml
+steps:
+- uses: actions/checkout@v3
+- uses: actions/setup-python@v4
+  with:
+    python-version-file: 'pyproject.toml' # Read python version from a file pyproject.toml
+- run: python my_script.py
+```
+
 ## Check latest version
 
 The `check-latest` flag defaults to `false`. Use the default or set `check-latest` to `false` if you prefer stability and if you want to ensure a specific `Python or PyPy` version is always used.
@@ -405,7 +426,7 @@ jobs:
       with:
         python-version: "3.8.0"
         cache: "poetry"
-    - run: echo '${{ steps.cp310.outputs.cache-hit }}' # true if cache-hit occured on the primary key
+    - run: echo '${{ steps.cp310.outputs.cache-hit }}' # true if cache-hit occurred on the primary key
 ```
 
 ## Environment variables

package-lock.json

@@ -16,7 +16,8 @@
         "@actions/http-client": "^1.0.11",
         "@actions/io": "^1.0.2",
         "@actions/tool-cache": "^1.5.5",
-        "semver": "^7.1.3"
+        "@iarna/toml": "^2.2.5",
+        "semver": "^7.5.2"
       },
       "devDependencies": {
         "@types/jest": "^27.0.2",
@@ -330,15 +331,14 @@
       "integrity": "sha512-77EbyPPpMz+FRFRuAFlWMtmgUWGe9UOG2Z25NqCwiIjRhOf5iKGuzSe5P2w1laq+FkRy4p+PCuVkJSGkzTEKVw=="
     },
     "node_modules/@azure/ms-rest-js": {
-      "version": "2.6.6",
+      "version": "2.7.0",
-      "resolved": "https://registry.npmjs.org/@azure/ms-rest-js/-/ms-rest-js-2.6.6.tgz",
+      "resolved": "https://registry.npmjs.org/@azure/ms-rest-js/-/ms-rest-js-2.7.0.tgz",
-      "integrity": "sha512-WYIda8VvrkZE68xHgOxUXvjThxNf1nnGPPe0rAljqK5HJHIZ12Pi3YhEDOn3Ge7UnwaaM3eFO0VtAy4nGVI27Q==",
+      "integrity": "sha512-ngbzWbqF+NmztDOpLBVDxYM+XLcUj7nKhxGbSU9WtIsXfRB//cf2ZbAG5HkOrhU9/wd/ORRB6lM/d69RKVjiyA==",
       "dependencies": {
         "@azure/core-auth": "^1.1.4",
         "abort-controller": "^3.0.0",
         "form-data": "^2.5.0",
         "node-fetch": "^2.6.7",
-        "tough-cookie": "^3.0.1",
         "tslib": "^1.10.0",
         "tunnel": "0.0.6",
         "uuid": "^8.3.2",
@@ -358,19 +358,6 @@
         "node": ">= 0.12"
       }
     },
-    "node_modules/@azure/ms-rest-js/node_modules/tough-cookie": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-3.0.1.tgz",
-      "integrity": "sha512-yQyJ0u4pZsv9D4clxO69OEjLWYw+jbgspjTue4lTQZLfV0c5l1VmK2y1JK8E9ahdpltPOaAThPcp5nKPUgSnsg==",
-      "dependencies": {
-        "ip-regex": "^2.1.0",
-        "psl": "^1.1.28",
-        "punycode": "^2.1.1"
-      },
-      "engines": {
-        "node": ">=6"
-      }
-    },
     "node_modules/@azure/ms-rest-js/node_modules/uuid": {
       "version": "8.3.2",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.3.2.tgz",
@@ -2048,6 +2035,11 @@
       "integrity": "sha512-ZnQMnLV4e7hDlUvw8H+U8ASL02SS2Gn6+9Ac3wGGLIe7+je2AeAOxPY+izIPJDfFDb7eDjev0Us8MO1iFRN8hA==",
       "dev": true
     },
+    "node_modules/@iarna/toml": {
+      "version": "2.2.5",
+      "resolved": "https://registry.npmjs.org/@iarna/toml/-/toml-2.2.5.tgz",
+      "integrity": "sha512-trnsAYxU3xnS1gPHPyU961coFyLkh4gAD/0zQ5mymY4yOZ+CYvsPqUbOFSw0aDM4y0tV7tiFxL/1XfXPNC6IPg=="
+    },
     "node_modules/@istanbuljs/load-nyc-config": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/@istanbuljs/load-nyc-config/-/load-nyc-config-1.1.0.tgz",
@@ -4470,14 +4462,6 @@
       "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==",
       "dev": true
     },
-    "node_modules/ip-regex": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/ip-regex/-/ip-regex-2.1.0.tgz",
-      "integrity": "sha1-+ni/XS5pE8kRzp+BnuUUa7bYROk=",
-      "engines": {
-        "node": ">=4"
-      }
-    },
     "node_modules/is-ci": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/is-ci/-/is-ci-3.0.0.tgz",
@@ -6020,16 +6004,24 @@
     "node_modules/psl": {
       "version": "1.8.0",
       "resolved": "https://registry.npmjs.org/psl/-/psl-1.8.0.tgz",
-      "integrity": "sha512-RIdOzyoavK+hA18OGGWDqUTsCLhtA7IcZ/6NCs4fFJaHBDab+pDDmDIByWFRQJq2Cd7r1OoQxBGKOaztq+hjIQ=="
+      "integrity": "sha512-RIdOzyoavK+hA18OGGWDqUTsCLhtA7IcZ/6NCs4fFJaHBDab+pDDmDIByWFRQJq2Cd7r1OoQxBGKOaztq+hjIQ==",
+      "dev": true
     },
     "node_modules/punycode": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.1.1.tgz",
       "integrity": "sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==",
+      "dev": true,
       "engines": {
         "node": ">=6"
       }
     },
+    "node_modules/querystringify": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/querystringify/-/querystringify-2.2.0.tgz",
+      "integrity": "sha512-FIqgj2EUvTa7R50u0rGsyTftzjYmv/a3hO345bZNrqabNqjtgiDMgmo4mkUjd+nzU5oF3dClKqFIPUKybUyqoQ==",
+      "dev": true
+    },
     "node_modules/queue-microtask": {
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/queue-microtask/-/queue-microtask-1.2.3.tgz",
@@ -6077,6 +6069,12 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/requires-port": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/requires-port/-/requires-port-1.0.0.tgz",
+      "integrity": "sha512-KigOCHcocU3XODJxsu8i/j8T9tzT4adHiecwORRQ0ZZFcp7ahwXuRU1m+yuO90C5ZUyGeGfocHDI14M3L3yDAQ==",
+      "dev": true
+    },
     "node_modules/resolve": {
       "version": "1.20.0",
       "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.20.0.tgz",
@@ -6189,9 +6187,9 @@
       }
     },
     "node_modules/semver": {
-      "version": "7.3.8",
+      "version": "7.5.2",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.8.tgz",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.5.2.tgz",
-      "integrity": "sha512-NB1ctGL5rlHrPJtFDVIVzTyQylMLu9N9VICA6HSFJo8MCGVTMW6gfpicwKmmK/dAjTOrqu5l63JJOpDSrAis3A==",
+      "integrity": "sha512-SoftuTROv/cRjCze/scjGyiDtcUyxw1rgYQSZY7XTmtR5hX+dm76iDbTH8TkLPHCQmlbQVSSbNZCPM2hb0knnQ==",
       "dependencies": {
         "lru-cache": "^6.0.0"
       },
@@ -6460,14 +6458,15 @@
       }
     },
     "node_modules/tough-cookie": {
-      "version": "4.0.0",
+      "version": "4.1.3",
-      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-4.0.0.tgz",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-4.1.3.tgz",
-      "integrity": "sha512-tHdtEpQCMrc1YLrMaqXXcj6AxhYi/xgit6mZu1+EDWUn+qhUf8wMQoFIy9NXuq23zAwtcB0t/MjACGR18pcRbg==",
+      "integrity": "sha512-aX/y5pVRkfRnfmuX+OdbSdXvPe6ieKX/G2s7e98f4poJHnqH3281gDPm/metm6E/WRamfx7WC4HUqkWHfQHprw==",
       "dev": true,
       "dependencies": {
         "psl": "^1.1.33",
         "punycode": "^2.1.1",
-        "universalify": "^0.1.2"
+        "universalify": "^0.2.0",
+        "url-parse": "^1.5.3"
       },
       "engines": {
         "node": ">=6"
@@ -6609,9 +6608,9 @@
       }
     },
     "node_modules/universalify": {
-      "version": "0.1.2",
+      "version": "0.2.0",
-      "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
+      "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.2.0.tgz",
-      "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg==",
+      "integrity": "sha512-CJ1QgKmNg3CwvAv/kOFmtnEN05f0D/cn9QntgNOQlQF9dgvVTHj3t+8JPdjqawCHk7V/KA+fbUqzZ9XWhcqPUg==",
       "dev": true,
       "engines": {
         "node": ">= 4.0.0"
@@ -6626,6 +6625,16 @@
         "punycode": "^2.1.0"
       }
     },
+    "node_modules/url-parse": {
+      "version": "1.5.10",
+      "resolved": "https://registry.npmjs.org/url-parse/-/url-parse-1.5.10.tgz",
+      "integrity": "sha512-WypcfiRhfeUP9vvF0j6rw0J3hrWrw6iZv3+22h6iRMJ/8z1Tj6XfLP4DsUix5MhMPnXpiHDoKyoZ/bdCkwBCiQ==",
+      "dev": true,
+      "dependencies": {
+        "querystringify": "^2.1.1",
+        "requires-port": "^1.0.0"
+      }
+    },
     "node_modules/uuid": {
       "version": "3.4.0",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.4.0.tgz",
@@ -7169,15 +7178,14 @@
       }
     },
     "@azure/ms-rest-js": {
-      "version": "2.6.6",
+      "version": "2.7.0",
-      "resolved": "https://registry.npmjs.org/@azure/ms-rest-js/-/ms-rest-js-2.6.6.tgz",
+      "resolved": "https://registry.npmjs.org/@azure/ms-rest-js/-/ms-rest-js-2.7.0.tgz",
-      "integrity": "sha512-WYIda8VvrkZE68xHgOxUXvjThxNf1nnGPPe0rAljqK5HJHIZ12Pi3YhEDOn3Ge7UnwaaM3eFO0VtAy4nGVI27Q==",
+      "integrity": "sha512-ngbzWbqF+NmztDOpLBVDxYM+XLcUj7nKhxGbSU9WtIsXfRB//cf2ZbAG5HkOrhU9/wd/ORRB6lM/d69RKVjiyA==",
       "requires": {
         "@azure/core-auth": "^1.1.4",
         "abort-controller": "^3.0.0",
         "form-data": "^2.5.0",
         "node-fetch": "^2.6.7",
-        "tough-cookie": "^3.0.1",
         "tslib": "^1.10.0",
         "tunnel": "0.0.6",
         "uuid": "^8.3.2",
@@ -7194,16 +7202,6 @@
             "mime-types": "^2.1.12"
           }
         },
-        "tough-cookie": {
-          "version": "3.0.1",
-          "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-3.0.1.tgz",
-          "integrity": "sha512-yQyJ0u4pZsv9D4clxO69OEjLWYw+jbgspjTue4lTQZLfV0c5l1VmK2y1JK8E9ahdpltPOaAThPcp5nKPUgSnsg==",
-          "requires": {
-            "ip-regex": "^2.1.0",
-            "psl": "^1.1.28",
-            "punycode": "^2.1.1"
-          }
-        },
         "uuid": {
           "version": "8.3.2",
           "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.3.2.tgz",
@@ -8519,6 +8517,11 @@
       "integrity": "sha512-ZnQMnLV4e7hDlUvw8H+U8ASL02SS2Gn6+9Ac3wGGLIe7+je2AeAOxPY+izIPJDfFDb7eDjev0Us8MO1iFRN8hA==",
       "dev": true
     },
+    "@iarna/toml": {
+      "version": "2.2.5",
+      "resolved": "https://registry.npmjs.org/@iarna/toml/-/toml-2.2.5.tgz",
+      "integrity": "sha512-trnsAYxU3xnS1gPHPyU961coFyLkh4gAD/0zQ5mymY4yOZ+CYvsPqUbOFSw0aDM4y0tV7tiFxL/1XfXPNC6IPg=="
+    },
     "@istanbuljs/load-nyc-config": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/@istanbuljs/load-nyc-config/-/load-nyc-config-1.1.0.tgz",
@@ -10318,11 +10321,6 @@
       "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==",
       "dev": true
     },
-    "ip-regex": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/ip-regex/-/ip-regex-2.1.0.tgz",
-      "integrity": "sha1-+ni/XS5pE8kRzp+BnuUUa7bYROk="
-    },
     "is-ci": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/is-ci/-/is-ci-3.0.0.tgz",
@@ -11509,12 +11507,20 @@
     "psl": {
       "version": "1.8.0",
       "resolved": "https://registry.npmjs.org/psl/-/psl-1.8.0.tgz",
-      "integrity": "sha512-RIdOzyoavK+hA18OGGWDqUTsCLhtA7IcZ/6NCs4fFJaHBDab+pDDmDIByWFRQJq2Cd7r1OoQxBGKOaztq+hjIQ=="
+      "integrity": "sha512-RIdOzyoavK+hA18OGGWDqUTsCLhtA7IcZ/6NCs4fFJaHBDab+pDDmDIByWFRQJq2Cd7r1OoQxBGKOaztq+hjIQ==",
+      "dev": true
     },
     "punycode": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.1.1.tgz",
-      "integrity": "sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A=="
+      "integrity": "sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==",
+      "dev": true
+    },
+    "querystringify": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/querystringify/-/querystringify-2.2.0.tgz",
+      "integrity": "sha512-FIqgj2EUvTa7R50u0rGsyTftzjYmv/a3hO345bZNrqabNqjtgiDMgmo4mkUjd+nzU5oF3dClKqFIPUKybUyqoQ==",
+      "dev": true
     },
     "queue-microtask": {
       "version": "1.2.3",
@@ -11540,6 +11546,12 @@
       "integrity": "sha1-jGStX9MNqxyXbiNE/+f3kqam30I=",
       "dev": true
     },
+    "requires-port": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/requires-port/-/requires-port-1.0.0.tgz",
+      "integrity": "sha512-KigOCHcocU3XODJxsu8i/j8T9tzT4adHiecwORRQ0ZZFcp7ahwXuRU1m+yuO90C5ZUyGeGfocHDI14M3L3yDAQ==",
+      "dev": true
+    },
     "resolve": {
       "version": "1.20.0",
       "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.20.0.tgz",
@@ -11616,9 +11628,9 @@
       }
     },
     "semver": {
-      "version": "7.3.8",
+      "version": "7.5.2",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.8.tgz",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.5.2.tgz",
-      "integrity": "sha512-NB1ctGL5rlHrPJtFDVIVzTyQylMLu9N9VICA6HSFJo8MCGVTMW6gfpicwKmmK/dAjTOrqu5l63JJOpDSrAis3A==",
+      "integrity": "sha512-SoftuTROv/cRjCze/scjGyiDtcUyxw1rgYQSZY7XTmtR5hX+dm76iDbTH8TkLPHCQmlbQVSSbNZCPM2hb0knnQ==",
       "requires": {
         "lru-cache": "^6.0.0"
       }
@@ -11823,14 +11835,15 @@
       }
     },
     "tough-cookie": {
-      "version": "4.0.0",
+      "version": "4.1.3",
-      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-4.0.0.tgz",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-4.1.3.tgz",
-      "integrity": "sha512-tHdtEpQCMrc1YLrMaqXXcj6AxhYi/xgit6mZu1+EDWUn+qhUf8wMQoFIy9NXuq23zAwtcB0t/MjACGR18pcRbg==",
+      "integrity": "sha512-aX/y5pVRkfRnfmuX+OdbSdXvPe6ieKX/G2s7e98f4poJHnqH3281gDPm/metm6E/WRamfx7WC4HUqkWHfQHprw==",
       "dev": true,
       "requires": {
         "psl": "^1.1.33",
         "punycode": "^2.1.1",
-        "universalify": "^0.1.2"
+        "universalify": "^0.2.0",
+        "url-parse": "^1.5.3"
       }
     },
     "tr46": {
@@ -11914,9 +11927,9 @@
       "dev": true
     },
     "universalify": {
-      "version": "0.1.2",
+      "version": "0.2.0",
-      "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
+      "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.2.0.tgz",
-      "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg==",
+      "integrity": "sha512-CJ1QgKmNg3CwvAv/kOFmtnEN05f0D/cn9QntgNOQlQF9dgvVTHj3t+8JPdjqawCHk7V/KA+fbUqzZ9XWhcqPUg==",
       "dev": true
     },
     "uri-js": {
@@ -11928,6 +11941,16 @@
         "punycode": "^2.1.0"
       }
     },
+    "url-parse": {
+      "version": "1.5.10",
+      "resolved": "https://registry.npmjs.org/url-parse/-/url-parse-1.5.10.tgz",
+      "integrity": "sha512-WypcfiRhfeUP9vvF0j6rw0J3hrWrw6iZv3+22h6iRMJ/8z1Tj6XfLP4DsUix5MhMPnXpiHDoKyoZ/bdCkwBCiQ==",
+      "dev": true,
+      "requires": {
+        "querystringify": "^2.1.1",
+        "requires-port": "^1.0.0"
+      }
+    },
     "uuid": {
       "version": "3.4.0",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.4.0.tgz",

package.json

@@ -32,7 +32,8 @@
     "@actions/http-client": "^1.0.11",
     "@actions/io": "^1.0.2",
     "@actions/tool-cache": "^1.5.5",
-    "semver": "^7.1.3"
+    "@iarna/toml": "^2.2.5",
+    "semver": "^7.5.2"
   },
   "devDependencies": {
     "@types/jest": "^27.0.2",

src/find-python.ts

@@ -11,7 +11,7 @@ import * as tc from '@actions/tool-cache';
 
 // Python has "scripts" or "bin" directories where command-line tools that come with packages are installed.
 // This is where pip is, along with anything that pip installs.
-// There is a seperate directory for `pip install --user`.
+// There is a separate directory for `pip install --user`.
 //
 // For reference, these directories are as follows:
 //   macOS / Linux:

src/setup-python.ts

@@ -5,7 +5,13 @@ import * as path from 'path';
 import * as os from 'os';
 import fs from 'fs';
 import {getCacheDistributor} from './cache-distributions/cache-factory';
-import {isCacheFeatureAvailable, logWarning, IS_MAC} from './utils';
+import {
+  isCacheFeatureAvailable,
+  logWarning,
+  IS_MAC,
+  getVersionInputFromFile,
+  getVersionInputFromPlainFile
+} from './utils';
 
 function isPyPyVersion(versionSpec: string) {
   return versionSpec.startsWith('pypy');
@@ -22,43 +28,46 @@ async function cacheDependencies(cache: string, pythonVersion: string) {
   await cacheDistributor.restoreCache();
 }
 
-function resolveVersionInput() {
+function resolveVersionInputFromDefaultFile(): string[] {
-  const versions = core.getMultilineInput('python-version');
+  const couples: [string, (versionFile: string) => string[]][] = [
-  let versionFile = core.getInput('python-version-file');
+    ['.python-version', getVersionInputFromPlainFile]
-
+  ];
-  if (versions.length && versionFile) {
+  for (const [versionFile, _fn] of couples) {
-    core.warning(
+    logWarning(
-      'Both python-version and python-version-file inputs are specified, only python-version will be used.'
+      `Neither 'python-version' nor 'python-version-file' inputs were supplied. Attempting to find '${versionFile}' file.`
     );
+    if (fs.existsSync(versionFile)) {
+      return _fn(versionFile);
+    } else {
+      logWarning(`${versionFile} doesn't exist.`);
+    }
   }
+  return [];
+}
+
+function resolveVersionInput() {
+  let versions = core.getMultilineInput('python-version');
+  const versionFile = core.getInput('python-version-file');
 
   if (versions.length) {
-    return versions;
+    if (versionFile) {
-  }
+      core.warning(
-
+        'Both python-version and python-version-file inputs are specified, only python-version will be used.'
-  if (versionFile) {
-    if (!fs.existsSync(versionFile)) {
-      throw new Error(
-        `The specified python version file at: ${versionFile} doesn't exist.`
       );
     }
-    const version = fs.readFileSync(versionFile, 'utf8');
+  } else {
-    core.info(`Resolved ${versionFile} as ${version}`);
+    if (versionFile) {
-    return [version];
+      if (!fs.existsSync(versionFile)) {
+        throw new Error(
+          `The specified python version file at: ${versionFile} doesn't exist.`
+        );
+      }
+      versions = getVersionInputFromFile(versionFile);
+    } else {
+      versions = resolveVersionInputFromDefaultFile();
+    }
   }
 
-  logWarning(
-    "Neither 'python-version' nor 'python-version-file' inputs were supplied. Attempting to find '.python-version' file."
-  );
-  versionFile = '.python-version';
-  if (fs.existsSync(versionFile)) {
-    const version = fs.readFileSync(versionFile, 'utf8');
-    core.info(`Resolved ${versionFile} as ${version}`);
-    return [version];
-  }
-
-  logWarning(`${versionFile} doesn't exist.`);
-
   return versions;
 }
 

src/utils.ts

@@ -4,6 +4,7 @@ import * as core from '@actions/core';
 import fs from 'fs';
 import * as path from 'path';
 import * as semver from 'semver';
+import * as toml from '@iarna/toml';
 import * as exec from '@actions/exec';
 
 export const IS_WINDOWS = process.platform === 'win32';
@@ -181,3 +182,73 @@ export async function getOSInfo() {
     return osInfo;
   }
 }
+
+/**
+ * Extract a value from an object by following the keys path provided.
+ * If the value is present, it is returned. Otherwise undefined is returned.
+ */
+function extractValue(obj: any, keys: string[]): string | undefined {
+  if (keys.length > 0) {
+    const value = obj[keys[0]];
+    if (keys.length > 1 && value !== undefined) {
+      return extractValue(value, keys.slice(1));
+    } else {
+      return value;
+    }
+  } else {
+    return;
+  }
+}
+
+/**
+ * Python version extracted from the TOML file.
+ * If the `project` key is present at the root level, the version is assumed to
+ * be specified according to PEP 621 in `project.requires-python`.
+ * Otherwise, if the `tool` key is present at the root level, the version is
+ * assumed to be specified using poetry under `tool.poetry.dependencies.python`.
+ * If none is present, returns an empty list.
+ */
+export function getVersionInputFromTomlFile(versionFile: string): string[] {
+  core.debug(`Trying to resolve version form ${versionFile}`);
+
+  const pyprojectFile = fs.readFileSync(versionFile, 'utf8');
+  const pyprojectConfig = toml.parse(pyprojectFile);
+  let keys = [];
+
+  if ('project' in pyprojectConfig) {
+    // standard project metadata (PEP 621)
+    keys = ['project', 'requires-python'];
+  } else {
+    // python poetry
+    keys = ['tool', 'poetry', 'dependencies', 'python'];
+  }
+  const versions = [];
+  const version = extractValue(pyprojectConfig, keys);
+  if (version !== undefined) {
+    versions.push(version);
+  }
+
+  core.info(`Extracted ${versions} from ${versionFile}`);
+  return Array.from(versions, version => version.split(',').join(' '));
+}
+
+/**
+ * Python version extracted from a plain text file.
+ */
+export function getVersionInputFromPlainFile(versionFile: string): string[] {
+  core.debug(`Trying to resolve version form ${versionFile}`);
+  const version = fs.readFileSync(versionFile, 'utf8');
+  core.info(`Resolved ${versionFile} as ${version}`);
+  return [version];
+}
+
+/**
+ * Python version extracted from a plain or TOML file.
+ */
+export function getVersionInputFromFile(versionFile: string): string[] {
+  if (versionFile.endsWith('.toml')) {
+    return getVersionInputFromTomlFile(versionFile);
+  } else {
+    return getVersionInputFromPlainFile(versionFile);
+  }
+}