C:\Users\75377>python      ## 调用python
Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 23:03:10) [MSC v.1916 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy         ## 直接加载numpy，显示没有numpy模块
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'numpy'

3、退出python，使用pip命令进行安装

>>> quit()   ## 退出python
C:\Users\75377>pip install numpy -y  ## 直接安装
Usage:
  pip install [options] <requirement specifier> [package-index-options] ...
  pip install [options] -r <requirements file> [package-index-options] ...
  pip install [options] [-e] <vcs project url> ...
  pip install [options] [-e] <local project path> ...
  pip install [options] <archive url/path> ...
no such option: -y      ## 不能使用 -y
C:\Users\75377>pip install numpy   ## 安装 numpy
Collecting numpy
  Using cached numpy-1.21.4-cp38-cp38-win_amd64.whl (14.0 MB)
Installing collected packages: numpy
Successfully installed numpy-1.21.4   ## 安装成功
C:\Users\75377>

4、测试效果

C:\Users\75377>python
Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 23:03:10) [MSC v.1916 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy   ## 没有问题，可以调用
5、使用pip卸载 numpy
>>> quit()
C:\Users\75377>pip uninstall numpy    ## 卸载numpy包
Found existing installation: numpy 1.21.4
Uninstalling numpy-1.21.4:
  Would remove:
    d:\programs\python\lib\site-packages\numpy-1.21.4.dist-info\*
    d:\programs\python\lib\site-packages\numpy\*
    d:\programs\python\scripts\f2py.exe
Proceed (Y/n)? y
  Successfully uninstalled numpy-1.21.4   ## 卸载成功
6、测试卸载效果
C:\Users\75377>python
Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 23:03:10) [MSC v.1916 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy   ## 卸载成功
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'numpy'