F:\py>cd beautifulsoup4-4.9.3
F:\py\beautifulsoup4-4.9.3>pip install html5lib
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)'))': /simple/html5lib/
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)'))': /simple/html5lib/
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)'))': /simple/html5lib/
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)'))': /simple/html5lib/
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)'))': /simple/html5lib/
Could not fetch URL https://pypi.org/simple/html5lib/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/html5lib/ (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 html5lib
ERROR: No matching distribution found for html5lib
Could not fetch URL https://pypi.org/simple/pip/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/pip/ (Caused by SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1123)'))) - skipping
Anaconda环境变量问题，需要按照如下方式配置环境变量就可以了。
E:\anaconda3\Scripts
E:\anaconda3
E:\anaconda3\Library\bin以上3条，根据自己电脑的Anaconda环境来配置。
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