上课第二天（其实是第三天）

例：密码必须有大写字母，小写字母，数字

password =____________        #__里面可以用input()，也可以自定义输入

A='ABCD.....'

B='abcd.......'

C='1234.......'

count_1,count_2,count_3=False,False,False    #给参数赋值

for i in password:

     if i in A:

        count_1=True

     if i in B:

        count_2=True

     if i in C:

        count_3=True

if count_1 and count_2 and count_3:

   print('OK')

else:

    print('密码必须有大写字母，小写字母，数字')

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例：计算器

num1,num2=map(float,input('Num1,Num2:>>').split(',')) #同时输入2个数字

c=input('Choose Method : [+,-,-*,/]:>>')

if c in ' +,-,-*,/ ' :

 

if c == ' + ' :

print('OK')

print(' %f + %f = %f ' %(num1,num2,num1+num2))

elif c == ' - ' :

print(' %f - %f = %f ' %(num1,num2,num1-num2))

elif c == ' * ' :

print(' %f * %f = %f ' %(num1,num2,num1*num2))

elif c == ' / ' :

print(' %f / %f = %f ' %(num1,num2,num1/num2))

else:

#抛出异常

raise KeyError (' Only choose [ +,-,*,/ ] ')

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例：随机输出

#######这是用VS code

import random

res = random.choice( [ '石头' , ' 剪刀 ', ' 布 ' ] )

print(res)

 ########这是用Jupyter

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 银行输密码（3次）---------用for循环

password='151213'

mm=int(input('输密码(3次机会：)'))

for i in range(2):

if mm == password:

print('正确')

break

else:

print('错误',i+1,'次')

mm=int(input('输密码：(3次机会：)'))

else:

print('账号锁定')

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数组中随机输出：

import random

res=[ 'A' , ' B', ' 1 ', ' 2 ' ]

random.shuffle(res )

print(res)

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排序

a=[2,1,3]

a.sort()

print(a)

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昨天的例题：

a=int(input('Enter today’s day: '))
b=int(input('Enter the number of days elapsed since today: '))
week=['Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday']

wl=(a+b)%7

print("Today is %s and the future day is %s"%(week[a],week[wl]))

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a,b=map(int,input('输入年份及月份 ').split(','))
if (a%4==0 and a%100!=0) or (a%400==0):
e=int( '29')
else:
e=int( '28')

if b==1 or b==3 or b==5 or b==7 or b==8 or b==10 or b==12 :
t=int( '31')
elif b==4 or b==6or b==9 or b==11:
t=int( '30')
else:
t==e

print('%d 年 %d 月份有 %d 天' %(a,b,t))

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########昨天写死了，今天要补死了，啊啊啊啊啊