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
"""