[Tutor] Re: This Deletes All my Files

[Chad Crabtree]

Thank you all for answering my question.  I thought it would be some 
misunderstanding on my part.  The example Andrei made was very
telling.

Andrei wrote:

>>>>s = "d:/tests/test.txt"
>>>>class dummyfile(object):
>>>>        
>>>>
>...     def open(self, *args):
>...         print "dummyfile.open:", args
>...     def write(self, *args):
>...         print "dummyfile.write:", args
>...     def read(self, *args):
>...         print "dummyfile.read:", args
>...         return ""
>  
>
>>>>def dummyopen(filename, type):
>>>>        
>>>>
>...     print "dummyopen:", filename, type
>...     d = dummyfile()
>...     d.open(filename, type)
>...     return d
>
>  
>
>>>>dummyopen(s, 'w').write(dummyopen(s, 'r').read())
>>>>        
>>>>
>dummyopen: d:/tests/test.txt w
>dummyfile.open: ('d:/tests/test.txt', 'w') <--- first open for
writing
>dummyopen: d:/tests/test.txt r
>dummyfile.open: ('d:/tests/test.txt', 'r') <--- then for reading
>dummyfile.read: ()
>dummyfile.write: ('',)
>
>  
>
>>spend 5 hours RTFM.  I got it to work by breaking it up to several 
>>statements, but I would like to know.
>>    
>>
>
>And that's the way you *should* write it - code like this doesn't
deserve to
>work anyway :). 
>
>Yours,
>
>Andrei
>
>_______________________________________________
>Tutor maillist  -  Tutor at python.org
>http://mail.python.org/mailman/listinfo/tutor
>
>
>  
>



		
__________________________________ 
Do you Yahoo!? 
The all-new My Yahoo! - Get yours free! 
http://my.yahoo.com