ci: run python flow only when files under the python/ path are changed

.github/workflows/python.yml

@@ -3,8 +3,13 @@ name: Python
 on:
   push:
     branches: [ main ]
+    paths:
+    - python
+
   pull_request:
     branches: [ main ]
+    paths:
+    - python
 
 jobs:
 
@@ -13,31 +18,31 @@ jobs:
 
     strategy:
       matrix:
-        python-version: [3.8]
+        python-version: [ 3.8 ]
 
     steps:
-      - name: Checkout code
-        uses: actions/checkout@v2
+    - name: Checkout code
+      uses: actions/checkout@v2
 
-      - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
-        with:
-          python-version: ${{ matrix.python-version }}
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
 
-      - name: Install poetry
-        run: pip install poetry==1.1.13
+    - name: Install poetry
+      run: pip install poetry==1.1.13
 
-      - name: Install package
-        run: |
-          cd python
-          poetry install
+    - name: Install package
+      run: |
+        cd python
+        poetry install
 
-      - name: Test
-        run: |
-          cd python
-          poetry run pytest -v -s tests
+    - name: Test
+      run: |
+        cd python
+        poetry run pytest -v -s tests
 
-      - name: Lint
-        run: |
-          cd python
-          poetry run flake8 .
+    - name: Lint
+      run: |
+        cd python
+        poetry run flake8 .