May I ask why? pip cache is not found

jobs:
  
  build:
  
    runs-on: ${{ matrix.os }}
    environment: build
    permissions:
      contents: write

    strategy:
      matrix:
        os: [ macos-12 ]

    steps:
     
      - uses: actions/checkout@v3
        with:
          submodules: recursive
      - uses: actions/setup-python@v4
        with:
          python-version: '3.9'
          architecture: "x64"
          cache: 'pip'
      - run: |
          pip install -r requirements.txt

There is no cache for each build

I don’t know why. Every build indicates that there is no cache

[duolabmeng6]

I have understood the reason. Thank you very much for your help

[duolabmeng6]

@duolabmeng6 👋 Root cause of your problem is that you are running your workflow each time on a different branch (or tag) and there was not a single run on the main branch. You can read about restrictions for accessing a cache here.

Thank you very much for your answer. I’m reading the information you sent