我无法使用pip安装任何软件包

Question

我正在尝试使用pip install numpy在python中安装软件包。...总是以该错误结尾：

Could not fetch URL https://pypi.org/simple/numpy/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/numpy/ (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1056)'))) - skipping

ERROR: Could not find a version that satisfies the requirement numpy (from versions: none)
ERROR: No matching distribution found for numpy......

我已禁用防病毒软件并关闭了防火墙。.但是仍然无法正常工作！

请帮助..... 在此先感谢：）