字典表可以给方法 

def hello_chinese(name):

    print('你好:',name)

def hello_english(name):

    print('hello:',name)

operation={

    'e': hello_english,

    'c': lambda name : print ('你好', name)

}

while True:

    name = input('请输入姓名：\n')

    if name == 'stop':

        break

    language = input ('请选择语言版本：\n' c: 中文版\n e:英文版\n)

    operation. get(language, hello_chinese)(name)

def hello_chinese(name):

    print('你好:',name)

def hello_english(name):

    print('hello:',name)

def hello(action，name):

    action(name)

hello(hello_chinese,'Tom')

hello(lambda name: print('...',name), 'Tom') 

l = list(range(1,21))

result = []

//1. 使用循环，效率最低

for n in l:

    if n % 2 ==0

        rasult.append(n)

//2.使用推导

result = [x for x in l if x%2 == 0]

// 高级工具：map()，返回结果为map类型

def add_num(x):

    return x+5

res = list(map(add_num,l) ) //灵活性最高

//若不写list则显示不出来列表

res = list(map(lambda n: n**2,l)

print(result)

filter（函数，可迭代对象）

l = list (range(1,11))

def even_num(x):

    return x%2 ==0

res = list(filter(even_number,1))

print(res)

或: res = filter (even_num,1)

for n in res:

    print(n,end='')

或：

res =filter(lambda n: n%2 ==0, 1)

推导最好