迷你課程:Python-14~Decorators
Quick look
def mydecorator(function):
def wrapper():
print('I am a decorator')
function()
return wrapper
def hello_world():
print('Hello world')
mydecorator(hello_world)()
def mydecorator(function):
def wrapper():
print('I am a decorator')
#function()
return wrapper
def hello_world():
print('Hello world')
mydecorator(hello_world)()
##> only print 'I am a decorator'
因為mydecorator()是回傳wrapper 而沒有call 因此要再加()
def mydecorator(function):
def wrapper():
print('I am a decorator')
function()
return wrapper
@mydecorator
def hello_world():
print('Hello world')
hello_word()
會得到一樣結果
def mydecorator(function):
def wrapper():
print('I am a decorator')
function()
return wrapper
@mydecorator
def hello_world(person):
print(f'Hello {person}')
hello_word()
這樣會出錯，因為wrapper 並不允許輸入，但hello_world可以，可以這樣做
def mydecorator(function):
def wrapper(*args, **kargs):
print('I am a decorator')
function(*args, **kargs)
return wrapper
@mydecorator
def hello_world(person):
print(f'Hello {person}')
hello_word('YHD')
實際範例
