1、使用while循环输入: 1 2 3 4 5 6 8 9 10
#!/usr/bin/env python
# _*_ coding:utf8 _*_
a = 1
while a <= 10:
if a == 7:
pass
else:
print(a)
a = a + 1
2、求出1~100所有数的和:
#!/usr/bin/env python
# _*_ coding:utf8 _*_
a = 1
s = 0
while a <= 100:
a = a + 1
s = s + a
print(s)
3、输出1~100内所有的奇数:
#!/usr/bin/env python
# _*_ coding:utf8 _*_
a = 0
while a <= 100:
s = a % 2
if s == 0:
pass
else:
print(a)
a = a + 1
4、输出1~100内所有的偶数:
#!/usr/bin/env python
# _*_ coding:utf8 _*_
a = 0
while a <= 100:
s = a % 2
if s == 0:
print(a)
else:
pass
a = a + 1
5、求1-2+3-4+5 ... 99的所有数的和:
#!/usr/bin/env python
# _*_ coding:utf8 _*_
a = 1
s = 0
while a <= 99:
num = a % 2
if num == 0:
s = s - a
else:
s = s + a
a = a + 1
print(s)
6、用户登录(三次机会重试):
#!/usr/bin/env python
# _*_ coding:utf8 _*_
N = 1
while N <= 3:
Name = input("please enter your name: ")
if Name == 'root':
pass
else:
print('The user name you entered does not exist! Please re-enter!')
N += 1
if N == 4:
print('too many retries, the program exits!')
continue
N = 1
while N <= 3:
PassWord = input("please enter your password: ")
if PassWord == 'root123':
print('success login!')
exit()
else:
print('you enter the wrong password! Please re-enter!')
N += 1
if N == 4:
print('too many retries, the program exits!')
continue
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