base.py 文件源码

def __init__(self, stdout=None, stderr=None, no_color=False):
        self.stdout = OutputWrapper(stdout or sys.stdout)
        self.stderr = OutputWrapper(stderr or sys.stderr)
        if no_color:
            self.style = no_style()
        else:
            self.style = color_style()
            self.stderr.style_func = self.style.ERROR

        # `requires_model_validation` is deprecated in favor of
        # `requires_system_checks`. If both options are present, an error is
        # raised. Otherwise the present option is used. If none of them is
        # defined, the default value (True) is used.
        has_old_option = hasattr(self, 'requires_model_validation')
        has_new_option = hasattr(self, 'requires_system_checks')

        if has_old_option:
            warnings.warn(
                '"requires_model_validation" is deprecated '
                'in favor of "requires_system_checks".',
                RemovedInDjango19Warning)
        if has_old_option and has_new_option:
            raise ImproperlyConfigured(
                'Command %s defines both "requires_model_validation" '
                'and "requires_system_checks", which is illegal. Use only '
                '"requires_system_checks".' % self.__class__.__name__)

        self.requires_system_checks = (
            self.requires_system_checks if has_new_option else
            self.requires_model_validation if has_old_option else
            True)