import functools
# 原函数
def myfunc(a, b=2):
    """Docstring for myfunc()."""
    print(‘ called myfunc with:‘, a, b)
    return
# 输出函数
def show_details(name, f, is_partial=False):
    print(name)
    print(f)
    if not is_partial:
        print(f.__name__)
    if is_partial:
        print(f.func)
        print(f.args)
        print(f.keywords)
    return

# show_details(‘myfunc‘, myfunc)
# myfunc(‘a‘, 3)

p1 = functools.partial(myfunc, b=4)        # 包装后的函数
show_details(‘partial with named‘, p1, True)
p1(‘passing a‘)        # 调用包装后的函数
p1(‘override b‘, b=5)

functools.update_wrapper(p1, myfunc)      # 注释掉这一行，运行报错
print(p1.__name__)
print(p1.__doc__)

class MyClass(object):
    def method(self, a, b=2):
        """Docstring for method()."""
        print(‘ called method with:‘, a, b)
        return

o = MyClass()

p1 = functools.partial(o.method, b=4)
show_details(‘partial with named‘, p1, True)

functools.update_wrapper(p1, o.method)
print(p1.__name__)
print(p1.__doc__)

def simple_decorator(f):
    @functools.wraps(f)
    def decorated(a=‘decorated‘, b=1):
        print(a, b)
        f(a, b=b)
        return

    return decorated

wrapped = simple_decorator(myfunc)
print(wrapped.__name__)
print(wrapped.__doc__)