SSL certificate verify result: unable to get local issuer certificate (20), continuing anyway code example
Example 1: ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1091)
Once upon a time I stumbled with this issue. If you're using macOS go to Macintosh HD > Applications > Python3.6 folder (or whatever version of python you're using) > double click on "Install Certificates.command" file.
Example 2: SSL certificate problem: unable to get local issuer certificate
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);