pip 安装第三方包异常：[SSL: CERTIFICATE_VERIFY_FAILED]
安装第三方包： PyExecJS
命令：pip install PyExecJS报错：
...
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate in certificate chain (_ssl.c:1056)'))': /simple/pyexecjs/