标签:input bsp ... oop login span mat 三次 continue
1.
for i in range(10): #i是临时变量,range(10)表示从0-9 print(‘loop‘, i)
运行结果:
loop 0
loop 1
loop 2
loop 3
loop 4
loop 5
loop 6
loop 7
loop 8
loop 9
2.
for i in range(0, 10, 2): # 其中的2表示步长,也就是隔一个数 print(‘loop‘, i)
运行结果:
loop 0
loop 2
loop 4
loop 6
loop 8
3. 循环套循环
for i in range(10): print(‘--------‘,i) for j in range(10): print(j) if j> 5: break
运行结果:
-------- 0
0
1
2
3
4
5
6
-------- 1
0
1
2
3
4
5
6
一直到 i为9时
4. break是结束循环。continue是跳出本次循环,进入下一次循环
功能:用户登录,最多可登录三次
import getpass _username = ‘dmr‘ _password = ‘123‘ for i in range(3): username = input(‘username:‘) password = getpass.getpass(‘password:‘) if username == _username and password == _password: print(‘Welcome user {name} login...‘.format(name=username)) break else: continue else: print(‘invalid username and password‘)
标签:input bsp ... oop login span mat 三次 continue
原文地址:http://www.cnblogs.com/sunnnyy37/p/6828420.html