Could not find a version that satisfies the requirement cryptography (from pymysql) (from versions:
今天使用pip安装pymysql时出现如下错误：
Could not find a version that satisfies the requirement cryptography (from pymysql) (from versions: )
No matching distribution found for cryptography (from pymysql)
使用pip安装其他模块时也可能出现上述错误，主要原因是网络的问题，需要使用国内的镜像源来加速，比如豆瓣源
因此命令可以使用：
pip install scrapy -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com
或者
pip3 install scrapy -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com
即可成功安装。
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