函式裝飾器

#-----函式裝飾器-----

1、作用域：l _e_g_b
2、高階函式 a、函式名可以作為引數輸入 b、函式名可以作為返回值
3、閉包

1

defouter():
2 x = 10
3def inner(): #
inner是內部函式
4print(x) #
外部環境的乙個變數
5return inner #
內部函式inner就是乙個閉包
6outer()()78
#inner() #1、區域性變數,全域性變數無法呼叫

#-----關於閉包-----

閉包 = 函式 + 定義函式時的環境

#**原則：開放封閉原則  **書寫原則(對修改封閉，對擴充套件開放)

#-----裝飾器函式

1

import
time23
def show_time(f): #
裝飾器函式
4def
inner():
5 start =time.time()
6f()
7 time.sleep(1)
8 end =time.time()
9print("
spend %s
"% (end-start))
10return
inner
1112
@show_time
13def
foo():
14print('
test')
15#foo=show_time(foo)
16foo()
1718
@show_time
19def
bar():
20print('
bar')21
#bar = show_time(bar)
22bar()
2324
defshow_time(f):
25def
inner(x,y):
26 start =time.time()
27f(x,y)
28 time.sleep(1)
29 end =time.time()
30print(end-start)
31return
inner
3233
@show_time
34def
add1(a,b):
35print(a+b)
36 add1(1,2)

#-----裝飾器加引數

1

def logger(flag='
false'):
2def
show_time(f):
3def inner(*args):
4 start_time =time.time()
5 f(*args)
6 time.sleep(1)
7 end_time =time.time()
8print(end_time-start_time)
9if flag == "
true":
10print('
log!')
11return
inner
12return
show_time
1314 @logger('
true')
15def add(*args):
16 sum1 =0
17for i in
args:
18 sum1 +=i
19print
(sum1)
2021 add(1,2,4)

#-----使用者資訊登入驗證小程式-----

#-----建立用名密碼

1

import
json23
defcreate_user(a,b,c,d):
4 d =
8 with open(c,"w"
) as f:
9json.dump(d,f)
10 create_user("
dream
","abc123
","jd.json
","jd_list")
11 create_user("
rise
","rise123
","qq.json
","qq_list")
12 create_user("
wx","
wx123
","wx.json
","wx_list
")

#-----使用者資訊驗證

1

import
json
23 login_status = "
false"4
deflogin(auth_type):
5def
verify(func):
6def
inner():
7global
login_status
8 flag =true
9while
flag:
10 c_list = ['
jd','
qq','wx'
]11for i in
c_list:
12if auth_type ==i.strip():
13 files =auth_type
14 u_name = input("
please input %s name:
" %files).strip()
15 u_passwd = input("
please input %s passwd:
" %files).strip()
16 with open(("
%s.json
") % files, "r"
) as f:
17 data =dict(json.load(f))
18 name = data["
name"]
19 passwd = data["
passwd"]
20if u_name == name and u_passwd ==passwd:
21 login_status = "
true"22
func()
23 flag =false
24else:25
func()
26return
inner
27return
verify
2829 @login("jd"
)30defhome():
31print("
welcome to home page")
32home()
3334 @login("qq"
)35deffinance():
36print("
welcome to finance page")
37finance()
3839 @login("wx"
)40defbook():
41print("
welcome to book page")
42 book()

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