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示例一：
AGE
=
20
count
=
0
while
True
:
if
count
=
=
5
:
break
GUESS
=
int
(
input
(
"AGE:"
))
if
GUESS
=
=
AGE :
print
(
"It is right!"
)
break
elif
GUESS > AGE :
print
(
"It is bigger!"
)
else
:
print
(
"It is small!"
)
count
+
=
1
if
count
=
=
5
:
print
(
"You hava tried too many times!"
)
示例二：
_user
=
"root"
_passwd
=
"okooo123"
count
=
0
while
count<
3
:
username
=
input
(
"user:"
)
passwd
=
input
(
"passwd:"
)
if
_user
=
=
username
and
_passwd
=
=
passwd:
print
(
"Welcome"
)
break
elif
_user !
=
username
or
_passwd !
=
passwd:
print
(
"username or password is wrong"
)
count
+
=
1
else
:
print
(
"Too many times wrong !"
)
示例三：
user
=
"root"
count
=
0
while
count <
5
:
Guess
=
input
(
"user:"
)
if
Guess
=
=
user:
print
(
"It is right!"
)
break
elif
Guess !
=
user:
print
(
"It is wrong!"
)
count
+
=
1
else
:
print
(
"You input were wrong!"
)
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上面的三个示例均可实现while循环的基本知识，建议使用示例二的写法。
本文转自Mr_chen 51CTO博客，原文链接：http://blog.51cto.com/metis/1954874，如需转载请自行联系原作者
