python安装第三方库的几种方法基本可以解决所有的第三方库安装问题

1.pip install 库名
不行python -m pip install --upgrade pip升级后安装
或者多试几次,pip不稳定说不定第二次就成功了:
因为pip安装失败多数属于网速问题,换个网络环境再试一下吧,good luck to you!
eg:

C:\Users\ASUS>pip install pymongo
Collecting pymongo
  Could not find a version that satisfies the requirement pymongo (from versions: )
No matching distribution found for pymongo

C:\Users\ASUS>pip install pymongo
Collecting pymongo
  Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(, 'Connection to files.pythonhosted.org timed out. (connect timeout=15)')': /packages/10/35/f081e8f16cb357cc1e082743fed98fb699f3b9f215addc1b4b8bd1b58472/pymongo-3.7.2-cp37-cp37m-win_amd64.whl
  Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(, 'Connection to files.pythonhosted.org timed out. (connect timeout=15)')': /packages/10/35/f081e8f16cb357cc1e082743fed98fb699f3b9f215addc1b4b8bd1b58472/pymongo-3.7.2-cp37-cp37m-win_amd64.whl
  Downloading https://files.pythonhosted.org/packages/10/35/f081e8f16cb357cc1e082743fed98fb699f3b9f215addc1b4b8bd1b58472/pymongo-3.7.2-cp37-cp37m-win_amd64.whl (311kB)
    100% |████████████████████████████████| 317kB 19kB/s
Installing collected packages: pymongo
Successfully installed pymongo-3.7.2

2.在anaconda中安装(anaconda中又可能没有目标库)
3 .whl文件安装
https://www.lfd.uci.edu/~gohlke/pythonlibs/
pip install whlfilepath\filename.whl
4.查找目标库的pypi官网:
eg:snownlp
https://pypi.org/project/snownlp/0.12.3/#files


pip install path/filename.py
5.先下载sdk文件:
https://blog.csdn.net/xxzj_zz2017/article/details/79452028

6.下载GitHub上的python模块,比如itchat
7.有时会有GFW的问题,则使用国内源:(当然这里需要感谢豆瓣)

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

或者https加密的直接就信任了:

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