signature.py 文件源码

def __init__(self, func, types, typesentry_config):
        # The Config object
        self._tc = typesentry_config

        # The original function that was inspected
        self.function = func

        # List of all parameters (Parameter objects), positional and keyword
        self.params = []

        # Parameter object for the return value
        self.retval = Parameter("_return", kind="RETURN")

        # Index of the vararg parameter in self.params
        self._ivararg = None

        # Index of the varkws parameter in self.params
        self._ivarkws = None

        self._iargs = dict()

        # Maximum number of positional parameters (without varargs)
        self._max_positional_args = 0

        # Minimum number of arguments that must be supplied -- all the other
        # have defaults and can be omitted.
        self._min_positional_args = 0

        # Names of keyword-only arguments that have no defaults
        self._required_kwonly_args = set()

        # 0 or 1 depending on whether the function has 'self' argument. This
        # flag allows us to correctly report the number of arguments for a
        # method (1 less than what the signature suggests).
        self._num_self_args = 0

        #--------------------------------------------------------
        # This will initialize all of the arguments defined above
        self._fill_from_inspection_spec(types)

        # Function that can be invoked to check the type of the return value
        self.return_checker = self._make_retval_checker()

        # Function that can be invoked to check the arguments passed to the
        # inspected function.
        self.params_checker = self._make_args_checker()