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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。
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
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