[Tutor] odd behavior when renaming a file

[Dave Angel]

On 05/10/2012 12:56 PM, Alan Gauld wrote:
> On 09/05/12 20:26, Joel Goldstick wrote:
>> import os
>> def pre_process():
>>      if os.path.isfile('revelex.csv'):
>>          os.rename('revelex.csv', 'revelex.tmp')
>>          print "Renamed ok"
>>      else:
>>          print "Exiting, no revelex.csv file available"
>>          exit()
>>      out_file = open('revelex.csv', 'w')
>>      # etc.
>
>> When I run the code above it works file if run from the file.  But
>> when I import it and run it from another file it renames the file but
>> then prints "Exiting, no revelex.csv file available"
>
> I don;t know the reason but are you sure you want to open the file
> that you have just renamed?
>
> def pre_process():
>       if os.path.isfile('revelex.csv'):
>           os.rename('revelex.csv', 'revelex.tmp')
> ...
>       out_file = open('revelex.csv', 'w')
>       # etc.
>
> I would expect the open() to fail...
>

But he's opening it for WRITE, so it gets created just fine.



-- 

DaveA