os.environ -- DJANGO_SETTINGS_MODULE 如何设置

os.environ

首先，可以在终端中写入以下的代码：

import os 

for i, v in enumerate(os.environ.items(), 1): 
         print(i, v) 

获得的结果如下图所示：

os.environ中存放了所有的环境变量。

Django manage.py

if __name__ == "__main__":
 -->    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "djangotest.settings")
    try:
        from django.core.management import execute_from_command_line
    except ImportError:
        # The above import may fail for some other reason. Ensure that the
        # issue is really that Django is missing to avoid masking other
        # exceptions on Python 2.
        try:
            import django
        except ImportError:
            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?"
            )
        raise
    execute_from_command_line(sys.argv)

os.environ.setdefault(“DJANGO_SETTINGS_MODULE”, “djangotest.settings”)

当我们使用manage.py运行起本地的web服务器时，为了让Django知道使用哪个配置文件，就指定了DJANGO_SETTINGS_MODULE的环境变量的路径