add gitlab actions config

.github/workflows/python.yml

@@ -0,0 +1,28 @@
+name: Python Library
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.5", "3.6", "3.7", "3.8"]
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Set up env
+      run: |
+        python -m pip install --upgrade pip
+        pip install tox
+    - name: Lint with flake8
+      run: |
+        tox -e flake
+    - name: Test with pytest
+      run: |
+        # use "py", which is the default python version
+        tox -e py

tox.ini

@@ -18,5 +18,7 @@ deps =
     -rdev-requirements.txt
     flake8
 commands =
-# TODO: move options to dedicated flake8 config
-    flake8 --exclude telethon/tl/,telethon/errors/rpcerrorlist.py --ignore E501,F401 telethon/ tests/
+    # stop the build if there are Python syntax errors or undefined names
+    flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+    # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+    flake8 . --count --exit-zero --exclude telethon/tl/,telethon/errors/rpcerrorlist.py --max-complexity=10 --max-line-length=127 --statistics