目录
1、编写课上讲解的有参装饰器准备明天默写
def auth(login_type):
def outter(func):
def warpper(*args,**kwargs):
func(*args,**kwargs)
if login_type=="mysql":
print("基于数据库")
elif login_type=="file":
print("基于文件")
return warpper
return outter
@auth("mysql")
def my_mysql():
print("我是数据库函数")
@auth("file")
def my_file():
print("我是文件函数")
my_mysql()
my_file()
2、在文件开头声明一个空字典，然后在每个函数前加上装饰器，完成自动添加到字典的操作
d = {}
count = -1
def d_append(func):
def warpper():
global count
count += 1
func()
d[count]=[func.__name__,func]
return warpper
@d_append
def index():
print("我是主页")
@d_append
def footer():
print("我是尾页")
index()
footer()
3、编写日志装饰器，实现功能如：一旦函数f1执行，则将消息2017-07-21 11:12:11 f1 run写入到日志文件中，日志文件路径可以指定
import time
def timmer(func):
def warpper(*args,**kwargs):
func(*args,**kwargs)
file_path = input("请输入文件路径：")
with open(f"{file_path}","a",encoding="utf-8") as f :
f.write(time.strftime(f'%Y-%m-%d %X {func.__name__} run\n'))
return warpper
@timmer
def f1():
print("我是f1")
@timmer
def f2():
print("我是f2")
f1()
f2()
4、基于迭代器的方式，用while循环迭代取值字符串、列表、元组、字典、集合、文件对象
str1 = "hzisdsb"
list1 = [1,2,3,4]
dict1 = {"a":1,"b":2}
set1 = {1,2,3}
tuple1 = (1,2,3,)
def my_for(type,count=0):
iteration = type.__iter__()
while count<len(type):
print(iteration.__next__())
count+=1
my_for(str1)
my_for(list1)
my_for(dict1)
my_for(set1)
my_for(tuple1)
with open("a.txt","r",encoding="utf-8")as f :
while True:
try:
print(f.__next__())
except StopIteration:
break
5、自定义迭代器实现range功能
def my_rang(start,stop,step=1):
while start<stop:
yield start
start+=step
res = my_rang(1,100,1)
print(res.__next__())
print(res.__next__())
print(res.__next__())
来源：https://www.cnblogs.com/hz2lxt/p/12561679.html