pythonday1笔记

#######练习题######## print(‘1、使用while循环打印输入 1 2 3 4 5 6  8 9 10‘)# num = 1# while num <= 10:#     if num == 7:#         num = num + 1#         continue#     else:#         print(num)#         num += 1#######################################################2、打印1-100所有数的和# sum = 0# count = 1# while count < 101:#     sum = sum + count#     count = count + 1#     print(sum)#3、输出1-100内所有的奇数#for i in range(100):#    if i % 2 == 1:#        print(i)#4、输出1-100内所有的偶数#for i in range(100):#    if i % 2 == 0:#        print(i)# #5、打印1-2+3-4+5....+99所有数的和# sum = 0# for i in range(1,100):#     if i % 2 == 0:#         sum = sum - i#     elif i % 2 == 1:#         sum = sum + i# print(sum)#6、用户登录（3次机会重试）#第一种普通方式：li = [{‘username‘:‘alex‘,‘password‘:‘SB‘},{‘username‘:‘wusir‘,‘password‘:‘sb‘},{‘username‘:‘taibai‘,‘password‘:‘男神‘}]i = 0while i < 3:    name = input(‘请输入用户名:‘)    pwd = input(‘请输入密码:‘)    if name == ‘alex‘ and pwd == ‘SB‘:        print(‘登录成功‘)        break    elif name == ‘wusir‘ and pwd == ‘sb‘:        print(‘登录成功‘)        break    elif name == ‘taibai‘ and pwd == ‘男神‘:        print(‘登录成功‘)        break    else:        print(‘用户名和密码错误，你还有%s次机会‘ % (2-i))        i = i + 1        if i == 3:            choice = input(‘你是否还想再试试?Y‘)            if choice == ‘Y‘:                i = 0            else:                print(‘还要脸吗?‘)#第二种方式：

li = [{‘username‘:‘alex‘,‘password‘:‘SB‘},{‘username‘:‘wusir‘,‘password‘:‘sb‘},{‘username‘:‘taibai‘,‘password‘:‘男神‘}]
sum = 0
while sum < 3:
name = input(‘请输入用户名:‘)
pwd = input(‘请输入密码:‘)
for i in li:
if name == i[‘username‘] and pwd == i[‘password‘]:
print(‘登录成功‘)
sum = sum + 3
break
else:
print(‘用户名和密码错误,你还有%s次机会‘ % (2-sum))
sum = sum + 1
if sum == 3:
choice = input(‘你是否还想再试试?Y‘)
if choice == ‘Y‘:
sum = 0
else:
print(‘还要脸吗?‘)

原文地址：https://www.cnblogs.com/pharmacodia/p/8699142.html