#函数是第一类对象： 指的是函数可以被当做数据传递

# def func():

#     print('from func')

#可被引用

# f=func

#可以当做函数的参数

# def func():

#     print('from func')

# def foo(x):

#     print(x)

#     x()

# foo(func)

#可以当做函数的返回值

# def foo():

#     print('from foo')

# def bar():

#     return foo

# f=bar()

# print(f)

# print(foo)

# f()

# x=0

# def f1():

#     x=1

#     def f2():

#         # x=2

#         print(x)

#     return f2

# f=f1()

# print(f)

# f()

#可以当做容器类型的元素

# def select():

#     print('select function')

#

# func_dic={

#     'select':select,

# }

#

# print(func_dic['select'])

# func_dic['select']()

#

#

# def select():

#     print('select func')

#

# def delete():

#     print('delete func')

#

# def change():

#     print('change func')

#

# def add():

#     print('add func')

#

#

# while 1:

#     cmd=input('>>: ').strip()

#     if not cmd:continue

#     if cmd == 'select':

#         select()

#     elif cmd == 'delete':

#         delete()

#     elif cmd == 'change':

#         change()

#     elif cmd == 'add':

#         add()

#     else:

#         print('无效的命令')

def select(cmd_l):

    filename=cmd_l[-1]

    pattern=cmd_l[1]

    with open(filename,'r',encoding='utf-8') as f:

        for line in f:

            if pattern in line:

                print(line)

def delete():

    print('delete func')

def change():

    print('change func')

def add():

    print('add func')

def check():

    print('check func')

func_dic={

    'select':select,

    'delete':delete,

    'change':change,

    'add':add,

    'check':check,

}

while 1:

    inp=input('>>: ').strip()

    if not inp:continue             #如果输入为空则继续 输入自带bool值，如果为空，bool值为FALSE，不空则为True。

    cmd_l=inp.split()

    # print(cmd_l)

    cmd=cmd_l[0]

    if cmd in func_dic:

        func_dic[cmd](cmd_l)

    else:

        print('无效的命令')

#有参装饰器，在一般装饰器之外添加针对装饰函数的参数，增加了新参数，所以再加包一层

def deco(auth_type='file'):

    def auth(func):

        def wrapper(*args,**kwargs):

            if auth_type == 'file':

                print('文件的认证方式')

            elif auth_type == 'ldap':

                print('ldap认证方式')

            elif auth_type == 'mysql':

                print('mysql认证方式')

            else:

                print('不知到的认证方式')

        return wrapper

    return auth

@deco(auth_type='abc') #@auth #index=auth(index)

def index():

    print('welecome to index')

@deco(auth_type='ldap')

def home(name):

    print('welecome %s to home page' %name)

index()

home('egon')

with open(r'D:\py\empty\c.txt','r',encoding='utf-8') as f:

    print(sum([float(i.split()[1])*int(i.split()[2]) for i in f]))

    f.seek(0)       #光标初始化

    print([item for line in f for item in line.split() if item.isdigit()])

    f.seek(0)       #光标初始化

def init(func):                   #send必须传值到yield，所以需要先将生成器暂停到一个yield，相当于每次send之前先要初始化一次。如果send的时候不是yield暂停，会报错

    def wrapper(*args,**kwargs):

        g=func(*args,**kwargs)

        next(g)

        return g

    return wrapper

@init

def eater(name):

    print('%s ready to eat' %name)

    food_list=[]

    while True:

        food=yield food_list              #send传入的值给了yield，赋值给了food，但是执行结束的时候，返回值是food_list，和yield本身传入的值没有关系。

        food_list.append(food)

        print('%s start to eat %s' %(name,food))

# sleep(secs)    #------------------time.sleep()  I/O阻塞，（类似于input）不占cpu

# 线程推迟指定的时间运行，单位为秒。