import MyTank
a= Tank()
a.forward()
错误如下：
NameError：name 'Tank' is not defined
我不是import了吗？为什么会出这样的错误？怎么解决？
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看看Robert的邮件。你也可以写成
 
from MyTank import Tank
 
a= Tank()
a.forward()

-----Original Message-----
From: python-chinese-bounces at lists.python.cn [mailto:python-chinese-bounces at lists.python.cn]On Behalf Of 吴俊玉
Sent: Friday, March 31, 2006 3:04 PM
To: PYTHON邮件列表
Subject: [python-chinese] 不好意思，写错了



import MyTank

a= Tank()
a.forward()
错误如下：
NameError：name 'Tank' is not defined
我不是import了吗？为什么会出这样的错误？怎么解决？

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两种解决方法：
1. from MyTank import *
2. a = MyTank.Tank()

两个建议：
1. 阅读一下Python中关于import和module的文档
2. 请接着前一个topic发邮件


On 3/31/06, 吴俊玉 <wujunyu at gmail.com> wrote:
>
>  import MyTank
> a= Tank()
> a.forward()
> 错误如下：
> NameError：name 'Tank' is not defined
> 我不是import了吗？为什么会出这样的错误？怎么解决？
>
> _______________________________________________
> python-chinese
> Post: send python-chinese at lists.python.cn
> Subscribe: send subscribe to python-chinese-request at lists.python.cn
> Unsubscribe: send unsubscribe to  python-chinese-request at lists.python.cn
> Detail Info: http://python.cn/mailman/listinfo/python-chinese
>
>


--
Robert
Python源码剖析――http://blog.donews.com/lemur/
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涉及package和module的用法
 
在java中 package a.b下面有一个C.java
你可以写成
 
package a.b;
 
public class C{
……
}
 
使用时写
import a.b.C;
……
c = new C();
 
在python中packege a.b下面有一个MyTank.py的module
MyTank.py里面可以有多个class: Tank,SuperTank,
所以使用时只import到MyTank时要使用Tank就要写成MyTank.Tank()
或者写成from a.b.MyTank import Tank来使用module里面的class Tank
 
 

-----Original Message-----
From: python-chinese-bounces at lists.python.cn [mailto:python-chinese-bounces at lists.python.cn]On Behalf Of 吴俊玉
Sent: Friday, March 31, 2006 3:04 PM
To: PYTHON邮件列表
Subject: [python-chinese] 不好意思，写错了



import MyTank

a= Tank()
a.forward()
错误如下：
NameError：name 'Tank' is not defined
我不是import了吗？为什么会出这样的错误？怎么解决？

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