Python Full Stack road Day20

first edited October 26, 2017, Thursday

Summary
I. Last Class review
Two. Decorative Device
Three. Adorner supplement
Homework
Summary today

Summary

References: Alex

1. Decorative Device
2. Non-parametric adorner
3. With reference decorator

I. Last Class review

1. Namespaces and Scopes
   1. Built-in namespaces
   2. Global namespaces
   3. Local name space
   4. Global scope: Built-in namespace, global namespace
   5. Local scope: Local namespace
2. function nesting and nesting scopes
3. Function object
4. Closed Package

Two. Decorative Device

1. Why use adorners and open closure principles
2. What is an adorner?
3. Simple implementation of a non-parametric adorner

import timedef timmer(func):    def wrapper():        start_time = time.time()        func()        stop_time = time.time()        print(‘run time is %s ‘ % (stop_time - start_time))    return wrapper@timmer        #index=timmer(index)def index():    time.sleep(3)    print(‘welcome to oldboy‘)index()        #wrapper()

1. Non-parametric decorator modifier part1

import  timedef timmer(func):    def foo(*args,**kwargs):        start_time = time.time()        func(*args,**kwargs)        stop_time = time.time()        print(‘run time is %s‘ % (stop_time - start_time))    return foo@timmer    #index = timmer(index)def index(name):    time.sleep(2)    print(‘welconme to my home! %s‘ % name)@timmer    #auth = timmer(auth)def auth(name,passwd):    print(name,passwd)index(‘egon‘)        #foo(‘egon‘)auth(‘liuyang‘,‘123‘)    #foo(‘liuyang‘,‘123‘)

1. Non-parametric decorator modifier part2

import timedef timmer(func):    def foo(*args,**kwargs):        start_time = time.time()        res = func(*args,**kwargs)        stop_time = time.time()        print(‘run time is %s ‘% (stop_time - start_time))        return res    return foo@timmer        # my_max = timmer(my_max)def my_max(x,y):    res = x if x > y else y    return resres = my_max(2, 3)        #foo(2, 3)print(res)

1. With reference decorator

def auth2(auth_type):    def auth(func):        def foo(*args,**kwargs):            name = input(‘username: ‘).strip()            passwd = input(‘passwd:‘)            if auth_type == ‘sql‘:                if name == ‘liuyang‘ and passwd == ‘123‘:                    print(‘auth successful‘)                    res = func(*args,**kwargs)                    return res                else:                    print(‘auth error‘)            else:                print(‘还没学会‘)        return foo    return auth@auth2(auth_type = ‘sql‘)        #index = auth(index)def index():    print(‘welcome to index page‘)index()        #foo()

Three. Adorner supplement

1. Function plus multiple non-parametric adorners

@ccc@bbb@aaadef func():    

1. Function plus a plurality of parametric adorners

@ccc(‘c‘)@bbb(‘b‘)@aaa(‘a‘)def func():    passfunc=ccc(‘c‘)(bbb(‘b‘)(aaa(‘a‘)(func)))

Homework

1. No

Summary today

1. Ready to be sorted

Python Full Stack road Day20