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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 #或者$ 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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