"""
# 创建装饰器, 要求如下:
# 1. 创建add_log装饰器, 被装饰的函数打印日志信息;
# 2. 日志格式为: [字符串时间] 函数名: xxx, 运行时间:xxx,
# 运行返回值结果:xxx
"""
import time
import functools
def add_log(fun):
@functools.wraps(fun)
def wrapper(*args,**kwargs):
start_time = time.time()
res = fun(*args,**kwargs)
end_time = time.time()
print('[%s] 函数名:%s,运行时间:%.6f,运行返回值结果:%d' %(time.ctime(),
fun.__name__,end_time - start_time,res))
return res
return wrapper
@add_log
def add(x,y):
time.sleep(1)
return x+y
print(add(1,10))
# print(time.ctime())
方法1:
def panduan(fun):
def wrapper(*args,**kwargs):
if 'root' in args:
fun(*args,**kwargs)
else:
print('error')
return wrapper
@panduan
def add_student(name):
print('添加学生信息.....')
add_student('root')
方法2:
import functools
import inspect
def is_root(fun):
@functools.wraps(fun)
def wrapper(*args,**kwargs):
#inspect.getcallargs返回值是字典,key值为:形参,value值为:形参对应实参
inspect_res = inspect.getcallargs(fun,*args,**kwargs)
print('inspect_res的返回值为:%s' %inspect_res)
if inspect_res.get('name') == 'root':
res = fun(*args,**kwargs)
return res
else:
print('not root user')
return wrapper
@is_root
def add_student(name):
print('添加学生信息...')
def del_student(name):
print('删除学生信息...')
add_student('westos')
"""
编写装饰器required_ints, 条件如下:
1). 确保函数接收到的每一个参数都是整数; # 如何判断变量的类型?
type(s), isinstance(s,str)
2). 如果参数不是整形数, 抛出异常raise TypeError(“参数必须为整形”)
"""
def required_ints(fun):
def wrapper(*args,**kwargs):
for i in args:
if not isinstance(i,int):
raise TypeError('参数必须为整型')
for i in kwargs.values():
if not isinstance(i,int):
raise TypeError('参数必须为整型')
res = fun(*args,**kwargs)
return res
return wrapper
@required_ints
def add(*args,**kwargs):
return sum(args) + sum(kwargs.values())
print(add(1,2,3,65,1.0,a=1,b=2))