python 小故事1

def test(a:str,b:int)->str:
    print(test.__annotations__)
    return a+str(b)

def doc_print():
    """this is test doc """
    pass

def pack_args(args):
    """test 解包参数列表 """
    print(list(range(*args)))

def func_lambda(m):
    """ 用一个lambda表达式来返回一个函数 """
    return lambda x:x+m


def sort_lambda(o):
    """ 传递一个小函数作为参数:"""
    o.sort(key=lambda x:x[0])
    return o


if __name__ == '__main__':

    a=test("a",2)
    print(doc_print.__doc__)
    pack_args([3,20,2])
    f=func_lambda(2)
    res=f(3)
    print(res)
    k = [("one", 11), ("three", 33), ("two", 22)]
    s=sort_lambda(k)
    print(s)

{'a': <class 'str'>, 'b': <class 'int'>, 'return': <class 'str'>}
this is test doc
[3, 5, 7, 9, 11, 13, 15, 17, 19]
5
[('one', 11), ('three', 33), ('two', 22)]