[Tutor] Append function

[Kent Johnson]

You seem to be giving a path to a directory rather than a single file. Also you are putting it in 
the wrong place, you should edit the allFiles list.

Kent

kumar s wrote:
> Hi Kent, 
>  Thank you for your suggestion.  I keep getting
> IOError permission denied every time I try the tips
> that you provided. I tried to lookup on this error and
> did not get reasonable answer. Is this error something
> to do with Windows OS?
> 
> Any suggestions. 
> 
> Thank you
> K
> 
> 
>>>>allColumns = [readColumns("C:\Documents and
> 
> Settings\myfiles")for filePath in file_list]
> 
> Traceback (most recent call last):
>   File "<pyshell#167>", line 1, in -toplevel-
>     allColumns = [readColumns("C:\Documents and
> Settings\myfiles")for filePath in file_list]
>   File "<pyshell#159>", line 2, in readColumns
>     rows = [line.split() for line in open(filePath)]
> IOError: [Errno 13] Permission denied: 'C:\\Documents
> and Settings\\myfiles'
> 
> 
> 
> 
>>def readColumns(filePath):
>>     rows = [ line.split() for line in
>>open(filePath) ]
>>     return zip(*rows)
>>
>># list of all the files to read
>>allFiles = [ 'f1.txt', 'f2.txt' ]
>>
>># both columns from all files
>>allColumns = [ readColumns(filePath) for filePath in
>>allFiles ]
>>
>># just the second column from all files
>>allSecondColumns = [ cols[1] for cols in allColumns
>>]
>>
>># a representative first column
>>col1 = allColumns[0][0]
>>
>># zip it up into rows
>>allRows = zip(col1, *allSecondColumns)
>>
>>for row in allRows:
>>     print '\t'.join(row)
>>
>>
>>Kent
> 
> 
> 
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