dist.py 文件源码

def __init__(self, description, standard=False, available=True,
            optional=True, require_features=(), remove=(), **extras):
        self.warn_deprecated()

        self.description = description
        self.standard = standard
        self.available = available
        self.optional = optional
        if isinstance(require_features, (str, Require)):
            require_features = require_features,

        self.require_features = [
            r for r in require_features if isinstance(r, str)
        ]
        er = [r for r in require_features if not isinstance(r, str)]
        if er:
            extras['require_features'] = er

        if isinstance(remove, str):
            remove = remove,
        self.remove = remove
        self.extras = extras

        if not remove and not require_features and not extras:
            raise DistutilsSetupError(
                "Feature %s: must define 'require_features', 'remove', or at least one"
                " of 'packages', 'py_modules', etc."
            )