多个装饰器执行顺序

多个装饰器执行顺序

from functools import wraps
def decorator_a(func):
print('Get in decorator_a')
@wraps(func)
def inner_a(args, **kwargs):
print('Get in inner_a')
return func(args, **kwargs)

return inner_a

def decorator_b(func):
print('Get in decorator_b')
@wraps(func)
def inner_b(args, **kwargs):
print('Get in inner_b')
return func(args, **kwargs)

return inner_b

@decorator_b # f = decorator_b(f) 此时 f = decorator_b(inner_a) = inner_b
@decorator_a # f = decorator_a(f) 此时 f = inner_a
def f(x):
print('Get in f')
return x * 2

f(1) # inner_b(1) ----> inner_a(1)

解析

"""
@decorator_a
def f(x):
print('Get in f')
return x * 2

相当于

def f(x):
print('Get in f')
return x * 2

f = decorator_a(f)
"""

执行顺序

"""
执行顺序
Get in decorator_a
Get in decorator_b
Get in inner_b
Get in inner_a
Get in f
"""