python class XII

# Review 
# work 
# decorator Advanced 
    # functools.wraps 
    # arguments decorative KKD 
    # more decorative decorator same function 
# decorator 
# development principles: Open Closed Principle 
# decorator role: without changing the original function in the case of a call mode, a function to add functionality around 
nature # decorators: closure function 
# Import from functools Wraps 
# DEF warpper (FUNC): # = Holiday FUNC 
# @wraps (FUNC) 
# Inner DEF (* args, kwargs **): 
# Print ( 'function is executed before being decorated to do') 
# RET = FUNC (* args, ** kwargs) 
# Print ( 'function is executed after being decorated to do') 
# RET return 
# Inner return 
# 
# # @wrapper warpper = Holiday (Holiday) 
# DEF Holiday (day): 
# '' 'which is a holiday notice' '' 
# Print ( '% s all holiday days' day%) 
# return 'love you Kai Li' 
#
Print # (Holiday .__ name__) 
# Print (Holiday .__ doc__ displays a) 
# RET = Holiday (. 3) #inner 
# Print (SET) 
# 
# # Outer DEF (* args, ** kwargs): 
# # Print (args) 
# # Print (* args) 
# # Inner DEF (* args): 
# # Print ( 'Inner:', args) 
# # Inner (* args) 
# # 
# # Outer (1,2,3,4) == # Outer (* [1,2,3,4]) == # Outer (* (1,2,3,4)) 
# 
# #. 1. decorators written as a function with the authentication function of a plurality of (the user's account password from file), 
## requires a successful landing, the follow-up functions are no longer need to enter a user name and password 
# FLAG = False 
# DEF the login (FUNC): 
# DEF Inner (* args, ** kwargs): 
#, Ltd. Free Join FLAG 
# '' 'landing procedures' '' 
# IF FLAG: 
# RET = FUNC (* args, ** kwargs) # FUNC is decorated function
Return RET # 
# the else: 
# username = INPUT ( 'username:') 
# = INPUT password ( 'password:') 
# username IF == 'boss_gold' and password == '222222': 
# the FLAG = True 
# RET = FUNC (* args, ** kwargs) # func is decorated function 
# return RET 
# the else: 
# Print ( 'login failed') 
# return Inner 
# @login 
# DEF shoplist_add (): 
# Print ( 'increase an item' ) 
# @login 
# DEF shoplist_del (): 
# Print ( 'delete an item') 
# 
# shoplist_add () 
# shoplist_del () 

# 2 written decorator, plus call recording function for multiple functions.Each call requires function function name will be written to a file called 
# def log (func):
Inner DEF # (* args, ** kwargs): 
# with Open ( 'log', 'A', encoding = 'UTF-. 8') AS F: 
# f.write (FUNC .__ name __ + '\ n-') 
# FUNC = RET (* args, ** kwargs) 
# return RET 
# return Inner 
# @log 
# DEF shoplist_add (): 
# Print ( 'increase an item') 
# @log 
# DEF shoplist_del (): 
# Print ( 'delete an item ') 
# shoplist_add () 
# shoplist_del () 

. # 1 written web content download function, function is required: users to pass a url, the function returns the result of the download page of the 
Import os 
from urllib.request Import urlopen 
DEF Cache ( FUNC): 
    DEF Inner (* args, ** kwargs): 
        IF os.path.getsize ( 'Web Cache'): 
            with Open ( 'Web Cache', 'RB') AS F:# Judge whether the content file
                f.read return () 
        RET = FUNC (* args, ** kwargs) #get () requests a web page 
        with open ( 'web_cache', ' wb') as f: # result of the request written to a file 
            f.write ( B '****' + RET) 
        return RET 
    return Inner 

@cache 
DEF GET (URL): 
    code = the urlopen (URL) .read 
    return code 
RET = GET ( 'http://www.baidu.com') 
Print ( RET) 
RET = GET ( 'http://www.baidu.com') 
Print (RET)

Generator function # 
# DEF Generator (): 
# Print (. 1) 
# return 'A' 
# RET = Generator () 
# Print (RET) 

Function # Function long as it contains all yield keyword generator 
#yield can not return work with and requires written in the function 
# DEF generator (): 
# Print (. 1) 
# the yield 'a' 
# # generator function: get a generator after the execution as a return value 
# RET = generator () 
# Print (RET ) 
# Print (RET .__ Next __ ()) 

# DEF Generator (): 
# Print (. 1) 
# the yield 'A' 
# Print (2) 
# the yield 'B' 
# G = Generator () 
# for I in G: 
# Print (I) 
# G RET = __ .__ Next () 
# Print (RET) 
# G RET = __ .__ Next () 
# Print (RET) 

# I wahaha% 
# DEF Wahaha ():
#     for i in range(100):
#         yield '娃哈哈%s'%i
#
# g=wahaha()
# count=0
# for i in g:
#     count +=1
#     print(i)
#     if count>50:
#         break
# #print('*******',g.__next__())
# count=0
# for i in g:
#     count +=1
#     print(i)
#     if count>100:
#         break

#带参数的装饰器
#500个函数
import time
FLAG=True
def timmer_out(flag):
    def timmer(func):
        def inner(*args,**kwargs):
            if flag:
                start=time.time()
                ret=func(*args,**kwargs)
                end=time.time()
                print(end-start)
                return ret
            else:
                ret=func(*args,**kwargs)
                return ret
        return inner
    return timmer
#timmer=timmer_out(FLAG)
@timmer_out(FLAG) #wahaha=timmer(wahaha)
def wahaha():
    time.sleep(0.1)
    print('wahawaha')
@timmer_out(FLAG)
def erguotou():
    time.sleep(0.1)
    print('ergoutoutoutotu')

wahaha()
erguotou()

def tail(filename):
    f=open('file',encoding='utf-8')
    while True:
        line=f.readline()
        if line.strip():
            yield line.strip()
g=tail('file')
for i in g:
    if '启丽' in i:
        print('我喜欢',i)

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