python流程处理
1.流程处理if...else
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#!/bin/bash/env python
#_*_ coding:utf-8 _*_
#python version :python3.6
import
getpass
n1
=
"abc"
p1
=
"123"
name
=
input
(
"input your name:"
)
passwd
=
getpass.getpass(
"input your passwd:"
)
if
name
=
=
n1
and
passwd
=
=
p1:
print
(
"welecome login !"
)
else
:
print
(
"user or pass is incorrect"
)
|
2.流程处理if...elif...elif...else
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#!/bin/bash/env python
#_*_ coding:utf-8 _*_
#python version:3.6
n1
=
21
name
=
int
(
input
(
"please input the number which you want to:"
))
if
name
=
=
n1:
print
(
"you are too smart!"
)
elif
name <
21
:
print
(
"is too small!"
)
else
:
print
(
"it is too big!"
)
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3.for循环
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例
1
：
# 循环10个数字
i
=
1
for
i
in
range
(
10
):
print
(i)
例
2
：
#猜年龄优化for...break
#可以输入10次机会，输入正确就退出。
n1
=
21
for
i
in
range
(
10
):
name
=
int
(
input
(
"please input the number which you want to:"
))
if
name
=
=
n1:
print
(
"you are too smart!"
)
break
;
elif
name <
21
:
print
(
"is too small!"
)
else
:
print
(
"it is too big!"
)
|
4.while循环
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#!/bin/bash/env python
#_*_ coding:utf-8 _*_
#python version：3.6
例
1
#循环数字，当循环10的时候退出
count
=
0
#设置计数器
while
True
:
print
(
"print:"
,count)
count
+
=
1
if
count
=
=
10
:
print
(
"loop completed"
)
break
;
#跳出循环
例
2
#猜年龄游戏，可以输入10次，但是输错3次就退出。
#测试是否可以输入10次，把count < 3 改成count <10 即可；
n1
=
21
count
=
0
while
True
:
if
count
=
=
10
:
print
(
"say goodbye!"
)
else
:
if
count <
3
:
name
=
int
(
input
(
"please input the number which you want to:"
))
if
name
=
=
n1:
print
(
"you are too smart!"
)
break
;
elif
name <
21
:
print
(
"is too small!"
)
else
:
print
(
"it is too big!"
)
else
:
print
(
"you are too failed!"
)
break
;
count
+
=
1
例
3
#猜年龄游戏，可以输入10次，但是输错3次，就再问一下你还要继续吗？不继续就退出。
n1
=
21
count
=
0
for
i
in
range
(
13
):
if
count <
3
:
name
=
int
(
input
(
"please input the number which you want to:"
))
if
name
=
=
n1:
print
(
"you are too smart!"
)
break
;
elif
name <
21
:
print
(
"is too small!"
)
else
:
print
(
"it is too big!"
)
else
:
print
(
"you are too failed!"
)
input1
=
input
(
"Do you want to continue? (y/n)"
)
if
input1
=
=
"y"
:
count
=
0
;
continue
;
else
:
print
(
"say goodbye!"
)
break
;
count
+
=
1
注意：counter
+
=
1
相等于 counter
=
counter
+
1
|
本文转自506554897 51CTO博客，原文链接：http://blog.51cto.com/506554897/1906437
，如需转载请自行联系原作者
