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pip卸载三方库

pip uninstall 第三方库名称

pip 升级三方库

在升级之前，我们需要先查看，如下：

1、查看命令

①查看已安装的库

pip list

②查看指定的库

pip show 库名称

2、升级命令

①查看可升级的库

pip list -o

②升级命令

pip install --upgrade 库名称

pip.main自动安装

"""如果引用的库未安装，则自动安装""" 
#为了明确异常信息，我们追加断言
try:
    import requests
    import pandas as pd
    from bs4 import BeautifulSoup
    import jieba
    import jieba.analyse
    import matplotlib.pyplot as plt
    from wordcloud import WordCloud,STOPWORDS
    import numpy as np
    from PIL import Image
# 使用pip.main()方法进行依赖库的安装（例举几个常用的库）   
except  ImportError:
    import pip
    pip.main(["install", "--user", "requests","beautifulsoup4","matplotlib","wordcloud","pandas","pillow"])
    import requests
    import pandas as pd
    from bs4 import BeautifulSoup
    import jieba
    import jieba.analyse
    import matplotlib.pyplot as plt
    from wordcloud import WordCloud,STOPWORDS
    import numpy as np    
    from PIL import Image 

os安装

import os

#需要安装的库
libs = ["requests","beautifulsoup4","matplotlib","wordcloud","pandas","pillow"]

#循环遍历安装
for lib in libs:
    os.system("pip install " + lib)

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