Django source: manage.py

1975 단어
#!/usr/bin/env python
import os
import sys

if __name__ == "__main__":
    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "mypro.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 A mapping object representing the string environment.

  • For example, environ['HOME'] is the pathname of your home directory.
    >>> import os
    >>> os.environ['HOME']
    '/home/alphacocoa'
    
  • dict.setdefault(key[, default]) If key is in the dictionary, return its value . If not, insert key with a value of default and return default . default defaults to None .
  • >>> os.environ.setdefault("DJANGO_SETTINGS_MODULE", "mypro.settings")
    'mypro.settings'
    >>> os.environ['DJANGO_SETTINGS_MODULE']
    'mypro.settings'
    >>> os.environ.setdefault("DJANGO_SETTINGS_MODULE", "mypro")
    'mypro.settings'              ; If key is in the dictionary, return its value.
    >>> os.environ['DJANGO_SETTINGS_MODULE']
    'mypro.settings'
    

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