Could not fetch URL https://pypi.org/simple/gevent/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url
: /simple/gevent/ (Caused by SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:841)'),)) - skipping
ERROR: Could not find a version that satisfies the requirement gevent (from versions: none)
ERROR: No matching distribution found for gevent
原因可能是你开了代理,把它关了就可以了。