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How to check the installed modules in python

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2019-07-10 17:09:1217509browse

How to check the installed modules in python

As I use python for longer and longer, more and more python modules are installed. After a long time, I don’t know what modules are installed in my Python, so I If you want to check the python module you installed, the viewing method is summarized as follows:

1. Use the pydoc command under the CMD command line to view

In the command Run $pydoc modules under the line to view

2. Use help() in the python interactive interpreter to view

Enter in the interactive interpreter>> ;> help("modules"), the effect is the same as entering $pydoc modules on the command line

3. Import the sys module to view under the python interactive interpreter

# python的sys模块也是可以用来查看模块信息的
>>> import sys
>>> sys.modules.keys()

4. Use pip to view under the command line

# 如果你使用的是pip来作为你的python包管理器的话,可以在命令行下直接运行$ pip freeze</code>
#或者<code>$ pip list来查看安装包的信息,当然其它的包管理器也有类似的功能,
#同时,你也可以在python交互式解释器中导入pip模块来查看包信息
import pip
installed_packages = pip.get_installed_distributions()
installed_packages_list = sorted(["%s==%s" % (i.key, i.version)
for i in installed_packages])
print(installed_packages_list)

5. Use yolk to view

# 如果你安装过yolk的话可以使用yolk命令来查看包信息,你可以使用$pip install yolk来安装它 
yolk使用简单,只需在命令行下操作即可
$ yolk -l    #列出所有安装模块
$ yolk -a    #列出激活的模块
$ yolk -n    #列出非激活模块
$ yolk -U [packagename]  # 通过查询pypi来查看(该)模块是否有新版本

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