python pip install solution

A move to solve the python pip install the library installation fails

 

PIP python is a powerful tool for the installation, but we often have problems installing the library fail, I think the most effective solution:

1. Open  https://www.lfd.uci.edu/~gohlke/pythonlibs website,

2. The name of the library search (CTRL + F) to be installed, such as pandas

 3. Locate the system and their corresponding version downloaded, when the latter cp Python digital version, such as version python3.6 cp36 representatives, the latter showing 32 32/64 WIN numbers or 64-bit system;

4. When the download using a file path name pip install + installation, e.g.

pip install c:\pandas‑0.23.4‑cp36‑cp36m‑win_amd64.whl 

When the processing method is not successful installation pip install

 

I installed pymysql, how can not be installed successfully:

Install with pip install pymysql:

总是出现错误：Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.VerifiedHTTPSConnection object at 0x00000238CE8677B8>, 'Connection to pypi.org timed out. (connect timeout=15)')': /simple/pymysql/

Unsuccessful, I try to install a conda install pymysql:

Or unsuccessful, and try to use python -m pip install pymysql installation:

Finally found actually slow network, to be installed package can not be successfully downloaded caused.

Solution:

pip install pymysql -i http://pypi.douban.com/simple --trusted-host pypi.douban.com

这些安装的数据包好几个网站都有镜像：

阿里云 http://mirrors.aliyun.com/pypi/simple/
中国科技大学 https://pypi.mirrors.ustc.edu.cn/simple/ 
豆瓣(douban) http://pypi.douban.com/simple/ 
清华大学 https://pypi.tuna.tsinghua.edu.cn/simple/
中国科学技术大学 http://pypi.mirrors.ustc.edu.cn/simple/
使用方法很简单，直接 -i 加 url 即可！如下：

pip install web.py -i http://pypi.douban.com/simple

或者

pip install web.py -i http://pypi.douban.com/simple --trusted-host pypi.douban.com

也可以把这些包源设置成默认的，方法是修改pip.ini文件的配置：比如

[ global]
index-url = http: //pypi.douban.com/simple
[ install]
trusted-host=pypi.douban.com