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"""Code to help understand functions
"""
import inspect
from typing import Callable, TypeVar, Generic, Iterator
def arity(func: Callable) -> int:
"""Returns the arity(number of args)
Given a callable this function returns the number of arguments it expects
>>> arity(lambda: 5)
0
>>> arity(lambda x: x)
1
:param func:
:return:
return len(inspect.signature(func).parameters)
F = TypeVar("F", bound=Callable)
class FunctionCollection(Generic[F]):
Represents a collection of functions that is hashable.
def __init__(self, *checkers: F):
self._checkers = checkers
self.hash = hash(tuple(self._checkers))
def __len__(self) -> int:
return len(self._checkers)
def __contains__(self, item) -> bool:
return item in self._checkers
def __iter__(self) -> Iterator[F]:
return iter(self._checkers)
def __hash__(self):
return self.hash
def __eq__(self, other):
if isinstance(other, FunctionCollection):
return self.hash == other.hash
if isinstance(other, list):
return tuple(other) == self._checkers
return False
meadsteve /
lagom
