Python装饰器用法与知识点小结

import time
# 装饰器函数
def wrapper(func):
  def done(*args,**kwargs):
    start_time = time.time()
    func(*args,**kwargs)
    stop_time = time.time()
    print('the func run time is %s' % (stop_time - start_time))
  return done
# 被装饰函数1
@wrapper
def test1():
  time.sleep(1)
  print("in the test1")
# 被装饰函数2
@wrapper
def test2(name):  #1.test2===>wrapper(test2)  2.test2(name)==dome(name)
  time.sleep(2)
  print("in the test2,the arg is %s"%name)
# 调用
test1()
test2("Hello World")

import time
user,passwd = 'admin','admin'
def auth(auth_type):
  print("auth func:",auth_type)
  def outer_wrapper(func):
    def wrapper(*args, **kwargs):
      print("wrapper func args:", *args, **kwargs)
      if auth_type == "local":
        username = input("Username:").strip()
        password = input("Password:").strip()
        if user == username and passwd == password:
          print("\033[32;1mUser has passed authentication\033[0m")
          res = func(*args, **kwargs) # from home
          print("---after authenticaion ")
          return res
        else:
          exit("\033[31;1mInvalid username or password\033[0m")
      elif auth_type == "ldap":
        print("ldap链接")
    return wrapper
  return outer_wrapper
@auth(auth_type="local") # home = wrapper()
def home():
  print("welcome to home page")
  return "from home"
@auth(auth_type="ldap")
def bbs():
  print("welcome to bbs page"
print(home()) #wrapper()
bbs()

from collections import Iterable
 isinstance([], Iterable)=========true

>>> from collections import Iterator
>>> isinstance((x for x in range(10)), Iterator)
======>True