Could not fetch URL https://pypi.org/simple/requests/: There was a problem confirming the ssl certificate:
HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/requests/
(Caused by SSLError(SSLError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:852)'),)) - skipping
其中一种可能的原因：其实并不是我们的Python环境或网络环境出了问题。我安装报错的原因，是因为当时开着抓包的代理软件（Fiddler）造成的。
fiddler 一开,爬虫就报这个错误
报错：Could not fetch URL https://pypi.python.org/simple/pip...
报错信息 Could not fetch URL https://pypi.python.org/simple/d...
一、报错问题 Could not fetch URL https://pypi.python.org/simple...
pip install 报错，"Could not fetch URL https"，[SSL: CERTIFIC...
本地requests 请求报错,连在terminal 中 下载 pip install requests 也报错:...
操作：pip install XXX 报错日志：Could not fetch URL https://pypi....
问题pip install nose报错Could not fetch URL https://pypi.pyth...
pip安装jieba报错： Could not fetch URL https://pypi.tuna.tsing...
Could not fetch URL https://pypi.python.org/simple/xlrd/:...
Could not fetch URL https://pypi.python.org/simple/opencv...
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