Python论坛的帖子：

Tue Jul 26 09:19:07 HKT 2005

pyc是运行py时由python自动编译出来的字节码文件，这样python在运行时实际上装入的是pyc文件，因此它与py文件是独立的，只不过由python自动来维护这个pyc文件，比如你的py文件发生了变化，python会自动再次进行编译。而且python在导入一个模块时是有一定的顺序的，在命令行下，你可以打印
sys.path看一看。一般当前目前是最前的，而且python在导
入一个模块时是严格按照sys.path的顺序来导入的，因此先找你当前目录下是否有base64.py或base64.pyc或base64.pyo都可以，然后再到其它目录中查找。


2005/7/26, Weiming Yin <yinwm at 163.com>:
> 这里就还有一个问题了，为什么pyc没有删除就会有错误呢?
> py 和 pyc
> 可以单独存在么？
> 
> limodou wrote:
> > 原来如此。
> >
> > 2005/7/26, Weiming Yin <yinwm at 163.com>:
> >
> >> 开始叫做base64，结果有问题
> >> 我把名字改成64了
> >> 但是base64。pyc没删除
> >>
> >>
> >>
> >> limodou wrote:
> >>
> >>> 我看你写的不是64.py吗？怎么是base64.py. 晕
> >>>
> >>> 2005/7/26, Weiming Yin <yinwm at 163.com>:
> >>>
> >>>
> >>>> 果然如
> >>>>
> >>>> Bruce Wang<number5 at gmail.com>
> >>>>
> >>>> 老兄所说。
> >>>> 开始的名字叫做base64，现在把名字改了，就好了
> >>>> 多谢
> >>>>
> >>>>
> >>>> limodou wrote:
> >>>>
> >>>>
> >>>>> 它不是base64而是64.py。我在自已的器上试过了，没有问题呀。因此还是环境的问题。
> >>>>>
> >>>>> 在 05-7-25，Bruce Wang<number5 at gmail.com> 写道：
> >>>>>
> >>>>>
> >>>>>
> >>>>>> 自己import 自己？
> >>>>>> 你在base64.py文件里面 from base64 import *??
> >>>>>>
> >>>>>> 把base64.py改成其他文件名看看，注意删掉目录下所有的*.pyc文件
> >>>>>>
> >>>>>> On 7/25/05, Weiming Yin <yinwm at 163.com> wrote:
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>> 还是不行
> >>>>>>> C:\Program Files\Hansky>python c:\a\base64.py -e 1 1 1
> >>>>>>> 1  =
> >>>>>>> Traceback (most recent call last):
> >>>>>>>   File "c:\a\base64.py", line 2, in ?
> >>>>>>>     from base64 import *
> >>>>>>>   File "c:\a\base64.py", line 18, in ?
> >>>>>>>     print v, " = ", encodestring(v),
> >>>>>>> NameError: name 'encodestring' is not defined
> >>>>>>>
> >>>>>>> limodou wrote:
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>> 不过在windows下你加上：
> >>>>>>>> #!/usr/bin/env python
> >>>>>>>> 这句话是没有用的，去掉它。然后执行：
> >>>>>>>>
> >>>>>>>> python 64.py
> >>>>>>>>
> >>>>>>>> 试试。
> >>>>>>>>
> >>>>>>>> 2005/7/25, Weiming Yin <yinwm at 163.com>:
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>> 好象不是，
> >>>>>>>>> 我现在吧他放到一个单独的目录比如c:\a
> >>>>>>>>> 也不行
> >>>>>>>>> 我看了一下c:\tmp\
> >>>>>>>>> 没法现什么可运行的，或者dll之类的文件
> >>>>>>>>> 如果我进入到c:\tmp
> >>>>>>>>> c:\tmp>64.py ...
> >>>>>>>>> 可以运行
> >>>>>>>>> 如果是在其他的目录
> >>>>>>>>> 比如c:\
> >>>>>>>>> c:\>c:\tmp\64.py ...
> >>>>>>>>> 就回有错误，这是为什么呢
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>> limodou wrote:
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>> 你的c:\bin目录下可能有一些与系统base64冲突的文件，找一找。
> >>>>>>>>>>
> >>>>>>>>>> 2005/7/25, Weiming Yin <yinwm at 163.com>:
> >>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>>> 我刚刚写了一个简单的python程序
> >>>>>>>>>>> 写的时候放在c:\tmp目录下
> >>>>>>>>>>> 程序上面写了#!/usr/bin/env python
> >>>>>>>>>>> 这个程序在c:\tmp运行的正常
> >>>>>>>>>>> 但是当我吧他放到c:\bin下的时候，运行的时候给我报错
> >>>>>>>>>>> Traceback (most recent call last):
> >>>>>>>>>>>   File "64.py", line 3, in ?
> >>>>>>>>>>>     from base64 import *
> >>>>>>>>>>>   File "c:\Python24\lib\base64.py", line 19, in ?
> >>>>>>>>>>>     # Standard Base64 encoding
> >>>>>>>>>>> NameError: name 'encodestring' is not defined
> >>>>>>>>>>>
> >>>>>>>>>>> 我引用了base64 module
> >>>>>>>>>>> 这是为什么啊
> >>>>>>>>>>>
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> >>>
> >>>
> >>
> >>
> >
> >
> >
> > ------------------------------------------------------------------------
> >
> > _______________________________________________
> > python-chinese list
> > python-chinese at lists.python.cn
> > http://python.cn/mailman/listinfo/python-chinese
> >
> 
> 
> 


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