python-3-条件判断练习题

# 1.使用 while 循环输出 1 2 3 4 5 6 8 9 10
count = 0
while count < 10:
    count += 1
    if count == 7:
        continue
    print(count)

# 2.求1-100的所有数之和
conut = 1
sum = 0
while conut <= 100:
    sum = conut + sum
    conut += 1
print(sum)

# 3.输出 1-100 内所有的奇数 和 偶数
conut = 1
while conut <=100:
    if conut % 2 == 0:
        print(‘偶数：‘, conut)
    elif conut % 2 == 1:
        print(‘奇数：‘, conut)
    conut += 1

# 4.求1-2+3-4+5-6...99所有数的和
conut = 1
sum = 0
while conut < 100:
    if conut % 2 == 0:
        sum = sum - conut
    else:
        sum = sum + conut
    conut += 1
print(sum)

# 5.用户登录（三次机会重试）
count = 0
while count < 4:
    username = input(‘请输入您的账号：‘)
    password = input(‘请输入您的密码：‘)
    a = 3 - int(count)
    if username == ‘gsxl‘ and password == ‘123‘:
        print(‘登录成功！‘)
        break
    else:
        if a != 0:
            print(‘登录失败，剩余%s次机会‘ % a)
        elif a == 0:
            print(‘您的密码已被锁定，请于24小时候再试！！！‘)
    count += 1