**記錄安裝過程中出現Requirement already satisfied: **
原因在之前存在過安裝
提示錯誤信息：
C:\Windows\system32>pip install django -i http://pypi.douban.com/simple --trusted-host pypi.douban.com
Looking in indexes: http://pypi.douban.com/simple
Requirement already satisfied: django in c:\users\sev\appdata\roaming\python\python38\site-packages (4.0)
Requirement already satisfied: backports.zoneinfo in c:\users\sev\appdata\roaming\python\python38\site-packages (from django) (0.2.1)
Requirement already satisfied: sqlparse>=0.2.2 in c:\users\sev\appdata\roaming\python\python38\site-packages (from django) (0.4.2)
Requirement already satisfied: tzdata in c:\users\sev\appdata\roaming\python\python38\site-packages (from django) (2021.5)
Requirement already satisfied: asgiref<4,>=3.4.1 in c:\users\sev\appdata\roaming\python\python38\site-packages (from django) (3.4.1)
解決的辦法是刪除錯誤：
Requirement already satisfied: ~django~需要刪除的因為已經存在而阻礙 in ~c:\users\sev\appdata\roaming\python\python38\site-packages (4.0)~此為需要刪除的路徑
Requirement already satisfied: ~backports.zoneinfo~需要刪除的因為已經存在而阻礙 in ~c:\users\sev\appdata\roaming\python\python38\site-packages (from django) (0.2.1)~此為需要刪除的路徑
Requirement already satisfied: ~sqlparse>=0.2.2~需要刪除的因為已經存在而阻礙 in ~c:\users\sev\appdata\roaming\python\python38\site-packages (from django) (0.4.2)~此為需要刪除的路徑
Requirement already satisfied: ~tzdata~需要刪除的因為已經存在而阻礙 in ~c:\users\sev\appdata\roaming\python\python38\site-packages (from django) (2021.5)~此為需要刪除的路徑
Requirement already satisfied: ~asgiref<4,>=3.4.1~需要刪除的因為已經存在而阻礙 in ~c:\users\sev\appdata\roaming\python\python38\site-packages (from django) (3.4.1)~此為需要刪除的路徑
再次安裝既可以【全部如下】：
C:\Windows\system32>pip install --target=C:\Program Files\Python38\Lib\site-packages django
ERROR: Invalid requirement: 'Files\Python38\Lib\site-packages'
Hint: It looks like a path. File 'Files\Python38\Lib\site-packages' does not exist.
C:\Windows\system32>pip install django -i http://pypi.douban.com/simple --trusted-host pypi.douban.com
Looking in indexes: http://pypi.douban.com/simple
Requirement already satisfied: django in c:\users\sev\appdata\roaming\python\python38\site-packages (4.0)
Requirement already satisfied: backports.zoneinfo in c:\users\sev\appdata\roaming\python\python38\site-packages (from django) (0.2.1)
Requirement already satisfied: sqlparse>=0.2.2 in c:\users\sev\appdata\roaming\python\python38\site-packages (from django) (0.4.2)
Requirement already satisfied: tzdata in c:\users\sev\appdata\roaming\python\python38\site-packages (from django) (2021.5)
Requirement already satisfied: asgiref<4,>=3.4.1 in c:\users\sev\appdata\roaming\python\python38\site-packages (from django) (3.4.1)
C:\Windows\system32>pip install --target=E:\djangoProject\study django
Collecting django
Using cached Django-4.0.1-py3-none-any.whl (8.0 MB)
Collecting backports.zoneinfo
Using cached backports.zoneinfo-0.2.1-cp38-cp38-win_amd64.whl (38 kB)
Collecting sqlparse>=0.2.2
Using cached sqlparse-0.4.2-py3-none-any.whl (42 kB)
Collecting asgiref<4,>=3.4.1
Using cached asgiref-3.5.0-py3-none-any.whl (22 kB)
Collecting tzdata
Using cached tzdata-2021.5-py2.py3-none-any.whl (339 kB)
Installing collected packages: tzdata, sqlparse, backports.zoneinfo, asgiref, django
Successfully installed asgiref-3.5.0 backports.zoneinfo-0.2.1 django-4.0.1 sqlparse-0.4.2 tzdata-2021.5
C:\Windows\system32>
新的問題又來了
Traceback (most recent call last):
File "c:\program files\python38\lib\runpy.py", line 194, in _run_module_as_main
return _run_code(code, main_globals, None,
File "c:\program files\python38\lib\runpy.py", line 87, in _run_code
exec(code, run_globals)