1. Use the pydoc command on the command line
Run it on the command line $ pydoc modulesto see
2. Use help() to view in the python interactive interpreter
python---> just type in the interactive interpreter , the effect is the same as >>> help("modules")typing in the command line$ pydoc modules
3. Import the sys module under the python interpreter to view
Python's sys module can also be used to view module information
>>> import sys
>>> sys.modules.keys()
Fourth, use pip to view under the command line
If you are using pip as your python package manager, you can run it directly on the command line $ pip freezeor $ pip listview the information about the installed package. Of course, other package managers have similar functions. At the same time, you can also interact with python Import the pip module into the interpreter to view package information
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
If you have installed yolk, you can use the yolk command to view the package information, you can use $ pip install yolkto install it
yolk is easy to use, just operate on the command line
$ 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