安装pandas的时候报错：
Traceback (most recent call last):
File “D:\Anaconda3\envs\py3.7\lib\site-packages\pip_vendor\urllib3\response.py”, line 438, in _error_catcher
yield
File “D:\Anaconda3\envs\py3.7\lib\site-packages\pip_vendor\urllib3\response.py”, line 519, in read
data = self._fp.read(amt) if not fp_closed else b""
File “D:\Anaconda3\envs\py3.7\lib\site-packages\pip_vendor\cachecontrol\filewrapper.py”, line 62, in read
data = self.__fp.read(amt)
File "D:\Anaconda3\en…

解决：
使用豆瓣源安装：

pip install pandas -i https://pypi.douban.com/simple

成功：