Requirements not found error + fix for error in black

README.md

@@ -49,27 +49,21 @@ steps:
       python-version: "3.7"
 ```
 
-### Examples
+> :information_source: python-lint-annotate expects a `requirements.txt` file in your project.
+> See example to generate one with `pipenv`.
+> Leave an empty one if needed.
+
+### More Examples
 * [Only lint changed files, and ignore missing docstrings](examples/actions-only_changed_files.yml)
+* [Install requirements from pipenv and lint all files](examples/actions-pipenv_requirements.yml)
 
 ## Details
 
 Uses `actions/setup-python@v2`. Only python `3.6` - `3.10` version are tested since
 they are by far most common now. Other python `3.x` versions should also work.
 Any python `2.x` versions are unsupported! You can lint on Linux, Windows and MacOS.
 
-The lintner versions are:
-
-```bash
-pycodestyle==2.8.0
-pydocstyle==6.1.1
-pylint==2.12.1
-mypy==0.910
-black==21.11b1
-flake8==4.0.1
-vulture==2.3
-isort==5.10.1
-```
+The linter versions are defined in [requirements.txt](requirements.txt)
 
 ## IMPORTANT - test environment
 

action.yml

@@ -86,20 +86,20 @@ runs:
         python-version: ${{ inputs.python-version }}
         architecture: x64
         cache: pip
-
-    - run: python --version
-      shell: bash
 
     - name: Windows install dependencies
       if: ${{ runner.os == 'Windows' }}
       run:  |
-        pip install -r ${{ github.action_path }}\requirements.txt
+        pip install -r requirements.txt  # project's dependencies
+        pip install -r ${{ github.action_path }}\requirements.txt  # linters
         echo "path_sep=" >> $GITHUB_ENV
       shell: pwsh
 
     - name: Posix install dependencies
       if: ${{ runner.os != 'Windows' }}
-      run:  pip install -r ${{ github.action_path }}/requirements.txt
+      run:  |
+        pip install -r requirements.txt  # project's dependencies
+        pip install -r ${{ github.action_path }}/requirements.txt  # linters
       shell: bash
 
     - name: Lint on Windows

examples/actions-pipenv_requirements.yml

@@ -0,0 +1,20 @@
+name: Install requirements from pipenv and lint all files
+on:
+  pull_request:
+    types: [ opened, reopened, synchronize, edited ]
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    name: Lint
+    steps:
+      - name: Check out source repository
+        uses: actions/checkout@v3
+      - name: Set up Python environment
+        uses: actions/setup-python@v3
+        with:
+          python-version: "3.8"
+      - name: Generate requirements.txt file
+        run: |
+          pip install pipenv
+          pipenv requirements > requirements.txt
+      - uses: marian-code/python-lint-annotate@v3

requirements.txt

@@ -1,8 +1,8 @@
-black==21.11b1
+black~=22.3.0
 flake8==4.0.1
 isort==5.10.1
 mypy~=0.961
 pycodestyle==2.8.0
 pydocstyle==6.1.1
 pylint==2.12.1
-vulture==2.3
+vulture==2.3