cache in CI

.github/workflows/python.yml

@@ -36,14 +36,47 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
+
       - name: Install Node.js 20
         uses: actions/setup-node@v4
         with:
           node-version: 20
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -e ".[test]"
+
+
+      - uses: actions/cache@v3
+        if: startsWith(runner.os, 'Linux')
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+      
+      - uses: actions/cache@v3
+        if: startsWith(runner.os, 'macOS')
+        with:
+          path: ~/Library/Caches/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+      
+      - uses: actions/cache@v3
+        if: startsWith(runner.os, 'Windows')
+        with:
+          path: ~\AppData\Local\pip\Cache
+          key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
@@ -55,6 +88,7 @@ jobs:
       #     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 --max-complexity=10 --max-line-length=127 --statistics
+
       - name: Test with pytest
         run: |
           ./tests.sh --cov-append