1,使用while循环输入 1 2 3 4 5 6 8 9 10
n = 1
while n < 11:
if n == 7:
pass
else:
print(n)
n = n + 1
print("---end---")
2，求1 - 100的所有数的和
n = 1
s = 0
while n < 101:
s = s + n
n = n + 1
print(s)
3，输出 1 - 100内的所有奇数
n = 1
while 1 < 101:
temp = n % 2
if temp == 0:
pass
else:
print(n)
n = n + 1
print("---end---")
4，输出 1 - 100内的所有偶数
n = 1
while 1 < 101:
temp = n % 2
if temp == 0:
print(n)
else:
pass
n = n + 1
print("---end---")
5，求1-2+3-4+5...99的所有数的和
s = 0
n = 1
while n < 101:
temple = n % 2
if temple == 0:
s = s - n
else:
s = s + n
n = n + 1
print(s)
6，用户登陆（三次机会重试）
count = 0
while count < 3:
user = input(">>>")
pwd = input(">>>")
if user == "321" and pwd == "123":
print("欢迎登陆")
break
else:
print("用户名或密码错误")
count = count + 1
来源：https://www.cnblogs.com/stone-666/p/11010719.html