ModuleNotFoundError：运行manage.py时没有名为“ django”的模块

Question

我已经安装了virtualenv，然后在Windows 10中安装了django。激活virtualenv并运行：python manage.py runserver之后，我得到了：

File "manage.py", line 10, in main
from django.core.management import execute_from_command_line
ModuleNotFoundError: No module named 'django'

The above exception was the direct cause of the following exception:

ImportError: Couldn't import Django. Are you sure it's installed and available
on your PYTHONPATH environment variable? Did you forget to activate a virtual
environment?

在运行django-admin.exe时也发现：

Note that only Django core commands are listed as settings are not properly
configured (error: Requested setting INSTALLED_APPS, but settings are not
configured. You must either define the environment variable
DJANGO_SETTINGS_MODULE or call settings.configure() before accessing
settings.).

Manage.py：

#!/usr/bin/env python
"""Django's command-line utility for administrative tasks."""
import os
import sys


def main():
    os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'wordcount.settings')
    try:
        from django.core.management import execute_from_command_line
    except ImportError as exc:
        raise ImportError(
            "Couldn't import Django. Are you sure it's installed and "
            "available on your PYTHONPATH environment variable? Did you "
            "forget to activate a virtual environment?"
        ) from exc
    execute_from_command_line(sys.argv)


if __name__ == '__main__':
    main()

Answer 1

您可以通过创建python程序并导入django来验证是否已安装django

import django 
print (django.VERSION)

以上代码将打印已安装的django版本，确认是否已安装django

Answer 2

您有2个Python版本：主要版本是默认安装的，另一个版本是virtualenv使用的。

在运行pip install django时，Python的主版本中安装了Django，这是因为PYTHONPATH环境变量引用的是主版本的路径，而不是virtualenv。

运行python manage.py runserver时也会发生同样的事情。它不能从virtualenv运行python。

要解决此问题，您需要从virtualenv中访问pip，然后可以将Django与之一起安装

C:\the\path\to\virtualenv\path\to\pip.exe install django

就像pip一样，从virtualenv运行python.exe

C:\the\path\to\virtualenv\path\to\python.exe manage.py runserver

如果您使用PyCharm进行开发，则可以轻松地将venv设置为解释器。

现在可以运行django，就像pip一样，您可以从virtualenv访问python

1-文件>设置>您的项目> Python解释器

2-单击右侧的设置图标，然后单击“添加”

3-单击Virtualenv Environment并选择位置

设置virtualenv后，您可以轻松地使用PyCharm来管理软件包