Python 裝飾器筆記

def wrap_in_tag_b(fn): #

wrap_in_tag_b 是真正的裝飾器
def 
return
"

" + fn() + "
"
return
defwrap_in_tag_i(fn):
def 
return
"" + fn() + "
"return
@wrap_in_tag_b
@wrap_in_tag_i
defhello():
return
"hello
"print(hello()) #
returns "hello world"

def

wrap_in_tag_b(fn):
def 
return
"

" + fn(arg) + "
"
return
defwrap_in_tag_i(fn):
defreturn
"" + fn(arg) + "
"return
@wrap_in_tag_b
@wrap_in_tag_i
defhello(name):
return
"hello {}
".formar(name)
print(hello('jack'))

def

wrap_in_tag(deco_arg):
#裝飾器引數：deco_arg
#可以在任意位置使用
def real_decorator(func): #
real_decorator才是即將返回的真正的裝飾器
#原函式引數：func_arg 
#只可以在此位置使用
def 
return
"<>
".format(deco_arg, func())
return
return
real_decorator
@wrap_in_tag('b
')@wrap_in_tag('i
')defhello():
return
"hello
"print(hello())

def

wrap_in_tag(deco_arg):
#裝飾器引數：deco_arg
#可以在任意位置使用
def real_decorator(func): #
real_decorator才是即將返回的真正的裝飾器
def 
#原函式引數：func_arg
#只可以在此位置使用
return
"<>
".format(deco_arg, func(func_arg))
return
return
real_decorator
@wrap_in_tag('b
')@wrap_in_tag('i
')defhello(name):
return
"hello {}
".format(name)
print(hello('
jack
'))

class

wrap_in_tag(object):
def__init__
(self, deco_arg):
self.tag =deco_arg #裝飾器引數：deco_arg
def__call__
(self, func):
defnewf(): #原函式無引數
return
"<>
".format(self.tag, func())
return
newf
@wrap_in_tag('b
')@wrap_in_tag('i
')defhello():
return
'hello
'print(hello())

class

wrap_in_tag(object):
def__init__
(self, deco_arg):
self.tag =deco_arg#裝飾器引數：deco_arg
def__call__
(self, func):
defnewf(func_arg): #原函式引數: func_arg
return
"<>
".format(self.tag, func(func_arg))
return
newf
@wrap_in_tag('b
')@wrap_in_tag('i
')defhello(name):
return
"hello {}
".format(name)
print(hello('
jack
'))

def

wrap_in_tag(deco_arg):
def real_decorator(func):
類方法接收第乙個引數都是self，這個必須有，而無論func_arg是否有!!!
return
"<>
".format(deco_arg, func(func_arg))
return
return
real_decorator
class
foo(object):
@wrap_in_tag('b
')@wrap_in_tag('i
')defhello(self, name):
return
'hello {}".format(name)
@wrap_in_tag('b
')@wrap_in_tag('i
')defbyebye(self, name):
return
'byebye {}".format(name)
f =foo()
print(f.hello('
jack
')

class

wrap_in_tag(object):
def__init__
(self, deco_arg):
self.tag =deco_arg
def__call__
(self, func):
def newf(slf, func_arg): #
slf必須！self被占用了，那就給第乙個引數另乙個名字slf（隨便）
return
"<>
".format(self.tag, func(func_arg))
return
newf
class
foo(object):
@wrap_in_tag('b
')@wrap_in_tag('i
')defhello(self, name):
return
'hello {}".format(name)
@wrap_in_tag('b
')@wrap_in_tag('i
')defbyebye(self, name):
return
'byebye {}".format(name)

f =foo()

print(f.hello(
'jack'))

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