day11-作业

1. 写一个生成式能够产生的数据为: 1, 4, 27, 256, 3125,…, 9**9

   gen1 = (n**n for n in range(1, 10))
   

2. 写一个生成式能够产生1-10中所有半径是偶数的圆的面积

   import math
   gen1 = (math.pi * r**2 for r in range(1, 11) if r & 1 == 0)
   

3. 写一个生成式交换字典的键和值，产生一个新的字典

   dict1 = {'a': 1, 'b': 2}
   dict2 = dict((dict1[key], key) for key in dict1)
   

4. 为函数写一个装饰器，在函数执行之后输出 after

   def output_after(fn):
       def test(*args, **kwargs):
           fn(*args, **kwargs)
           print('after')
       return test
   

5. 为函数写一个装饰器，把函数的返回值 +100 然后再返回。

   def add_100(fn):
       def test(*args, **kwargs):
           return fn(*args, **kwargs) + 100
       return test
       
       
   @add_100
   def sum(x, y):
       return x + y
   print(sum(100, 200))
   

5. 写一个装饰器@tag要求满足如下功能:


def tag(fn):
 def test(*args, **kwargs):
     return '
' + fn(*args, **kwargs) + '
'
 return test


@tag
def render(text):
    # 执行其他操作
    return text

@tag
def render2():
    return 'abc'

print(render('Hello'))   # 打印出: 
Hello
print(render2())     # 打印出: 
abc

6. 写一个装饰器@tag要求满足如下功能(需要使用带参的装饰器，自己先自学正在一下):

   def tag(name):
       def middle(fn):
           def test(*args, **kwargs):
               return '<' + name + '>' + fn(*args, **kwargs) + ''
           return test
       return middle
   
   
   
   @tag(name='p')
   def render(text):
       # 执行其他操作
       return text
   
   @tag(name='div')
   def render2():
       return 'abc'
   
   print(render('Hello'))   # 打印出: 
   Hello
   print(render2())     # 打印出: 
   abc
   

7. 为函数写一个装饰器，根据参数不同做不同操作。
   flag为True，则 让原函数执行后返回值加100，并返回。
   flag为False，则 让原函数执行后返回值减100，并返回。

   def tag(flag = True):
       if flag:
           def middle(fn):
               def test(*args, **kwargs):
                   return fn(*args, **kwargs) + 100
               return test
           return middle
       else:
           def middle(fn):
               def test(*args, **kwargs):
                   return fn(*args, **kwargs) - 100
               return test
           return middle
       
   
   @tag(flag=False)
   def sum(x,y):
       return x+y
   
   print(sum(100, 200))
   
   

   ​

8. 写一个斗地主发牌器
   方法一

cards1 = ['大王', '小王']
list5 = ['2', '3', '4', '5', '6', '7,', '8', '9', '10', 'J', 'Q', 'K', 'A']


def fn(char):
    for x in list5:
        cards1.append(char+x)


fn('♠')
fn('♥')
fn('♦')
fn('♣')
list1 = []
list2 = []
list3 = []
list4 = []


def card(cards):
    i = 0
    j = 0
    for x in set(cards):
        i += 1
        j += 1
        if i >= 52:
            list4.append(x)
        elif j == 1:
            list1.append(x)
        elif j == 2:
            list2.append(x)
        elif j == 3:
            j = 0
            list3.append(x)


card(cards1)
print(len(list1), list1)
print(len(list2), list2)
print(len(list3), list3)
print(list4)

方法二

import random
list1 = ['A', '2', '3', '4', '5', '6', '7', '8', '9', '10', 'J', 'Q', 'K']
cards = ['大王', '小王']


def fn(char: str):
    for x in list1:
        cards.append(char+x)


fn('♠')
fn('♥')
fn('♦')
fn('♣')
print(cards, len(cards))


def func1():
    for x in set(cards):
        yield x


gen1 = func1()
x = random.choice(cards)
i = 0
list4 = []
list2 = []
list3 = []

for _ in range(51):
    i += 1
    if i == 1:
        list2.append(next(gen1))
    elif i == 2:
        list3.append(next(gen1))
    elif i == 3:
        i = 0
        list4.append(next(gen1))


print(list2, len(list2))
print(list3, len(list3))
print(list4, len(list4))
print(x)