常见问题解决 --- pip SSLEOFError 和 ValueError: check_hostname requires server_hostname

问题

C:\Users\Administrator\Desktop>pip install scapy -i http://pypi.douban.com/simple --trusted-host pypi.douban.com
Looking in indexes: http://pypi.douban.com/simple
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1123)'))': /pypi/simple/scapy/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1123)'))': /pypi/simple/scapy/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1123)'))': /pypi/simple/scapy/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1123)'))': /pypi/simple/scapy/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1123)'))': /pypi/simple/scapy/
Could not fetch URL http://pypi.douban.com/simple/scapy/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='mirrors.cloud.tencent.com', port=443): Max retries exceeded with url: /pypi/simple/scapy/ (Caused by SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1123)'))) - skipping
ERROR: Could not find a version that satisfies the requirement scapy (from versions: none)
ERROR: No matching distribution found for scapy
Could not fetch URL http://pypi.douban.com/simple/pip/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='mirrors.cloud.tencent.com', port=443): Max retries exceeded with url: /pypi/simple/pip/ (Caused by SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1123)'))) - skipping

C:\Users\Administrator\Desktop>
C:\Users\Administrator\Desktop>

或者

ValueError: check_hostname requires server_hostname

解决办法

关闭代理重试