type_checker_decorator.py

def checktype(*types):
	def typerror(expect, got):
		raise TypeError('expecting {}, got{}'.format(expect, type(got)))

	def checker(fn):
		def receiver(*args, **kwargs):
			for _type, arg in zip(types, args):
				type(arg) is _type or typerror(_type, arg)
			return fn(*args, **kwargs)
		return receiver
	return checker

@checktype(int, str)
def foo(num, word):
	print(num ,word)

foo(1, '2')
# foo(1, 2)