1、python--第一天练习题

#1、使用while循环输入 1 2 3 4 5 6 8 9 10

k = 0
while k < 10:
    k += 1
    if k == 7:
        continue
    print(k)

#2.求1-100内所有数的和

k = 0
z = k
while k < 100:
    k += 1
    z += k
print(z)

sum = 0
for count in range(1,101):
    sum += count
print(sum)

#3、输出1-100内的所有奇数或偶数

for i in range(1,101):		#奇数
    if i % 2 == 1:
        print(i)
for i in range(1,101):		#偶数
    if i % 2 == 0:
        print(i)

#4、输出1-100内所有的偶数之和

sum = 0
for i in range(1,101):
    if i % 2 == 0:
        sum += i
print(sum)

#5.1-2+3-4+5...99的所有数的和

a = 0
b = 0
for i in range(1,101):
    if i % 2 == 0:
        a += i
    else:
        b += i
print(b-a)

#6.用户登录(三次机会)

user = 'fan'
paaswd = 'fan'
con = 0
while con < 3:
    user1 = input("请输入账号：")
    paaswd1 = input("请输入密码：")
    if user1 == user and paaswd == paaswd1:
        print("登陆成功")
        break
    else:
        print("密码错误")
    con += 1