python pip3 出现 HTTPSConnectionPool(host=’pypi.org’ port=443)

python pip3 执行时,出现如下情况: WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available. Could not fetch URL https://pypi.org/simple/pip/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retrie