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How to solve Python CERTIFICATE_VERIFY_FAILED issue

I run into this error when using pip install -r requirements.txt

ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:997)

Here is the very simple and clean solution on macOS:

  1. Open Finder and Search Install Certificates.command
  2. Get the file path by Get Info
  3. Open Terminal.app and type open /Application/Python */Install Certificates.command

After this script run to the end, it's OK.