[Tutor] a quick Q: how to use for loop to read a series of files with .doc end

[lina]

On Wed, Oct 5, 2011 at 10:45 AM, Dave Angel <d at davea.name> wrote:

> On 10/04/2011 10:22 PM, lina wrote:
>
>> On Wed, Oct 5, 2011 at 1:30 AM, Prasad, Ramit<ramit.prasad at jpmorgan.**com<ramit.prasad at jpmorgan.com>
>> >wrote:
>>
>>  But I still don't know how to get the
>>>> statistic result of each column,
>>>>
>>> Thanks.
>>> try:
>>>    cols = len( text[0] ) # Find out how many columns there are (assuming
>>> each row has the same number of columns)
>>> except IndexError:
>>>    raise #  This will make sure you can see the error while developing;
>>>
>>>  This part:
>>
>> It's showed up:
>>
>>     except IndexError:
>>
> Best guess I can make is that the line "each row has..."  needs a # in
> front of it.  or maybe your code looks like the following, which has no try
> block at all.
>
> The except clause has to be the first line at the same indentation as the
> try line it's protecting.
>
>
>           ^
>> SyntaxError: invalid syntax
>>
>> for fileName in os.listdir("."):
>>     if os.path.isfile(fileName) and os.path.splitext(fileName)[1]=**
>> =".xpm":
>>         filedata = open(fileName)
>>         text=filedata.readlines()
>>         cols = len(text[0])
>>         except IndexError:
>>             print ("Index Error.")
>>         result=[]
>>         for idx in xrange(cols):
>>             results.append(0)
>>         for line in text:
>>             for col_idx, field in enumerate(line):
>>                 if token in field:
>>                     results[col_idx]+=1
>>             for index in col_idx:
>>                 print results[index]
>>
>> it showed up:
>>
>>     print results[]
>>                 ^
>> SyntaxError: invalid syntax
>>
>> Sorry, I am still lack deep understanding about something basic. Thanks
>> for
>> your patience.
>>
>>
>>  Simplest answer here is you might have accidentally run this under Python
> 3.x.  That would explain the syntax error on the print function.   Pick a
> single version and stick to it.  In fact, you might even put a version test
> at the beginning of the code to give an immediate error.
>
choose python3.

>
> But you do have many other problems with the code.  One is that this no
> longer does anything useful with multiple tokens.  (See my last email to see
> an approach that handles multiple tokens).  Another is that you mix result
> and results.  They're entirely distinct.  So pick one spelling and stick to
> it.

This is a very good suggestions, I choose results.

> Another is that for the "for index" is indented wrong, and uses the wrong
> limit value.  As it stands, it's trying to iterate over an integer.  You
> probably want to replace the whole phrase with something like for item in
> results: print item
>
> This example illustrates one reason why it's a mistake to write all the
> code at top level.  This code should probably be at least 4 functions, with
> each one handling one abstraction.
>
It's frustrating. Seriously. (I think I need to read some good (relevant)
codes first.

>
> Further, while you're developing, you should probably put the test data
> into a literal (probably a multiline literal using triplequotes), so you can
> experiment easily with changes to the data, and see how it results.
>


 #!/bin/python

import os.path

tokens=['B','E']

for fileName in os.listdir("."):
    if os.path.isfile(fileName) and os.path.splitext(fileName)[1]==".xpm":
        filedata = open(fileName)
        text=filedata.readlines()
        results={}
        numcolumns=len(text.strip())
        for ch in tokens:
            results[ch]=[0]*numcolumns
        for line in text:
            for col, ch in enumerate(line):
                if ch in tokens:
                    results[ch][col]+=1
        for item in results:
                print item

$ python3 counter-vertically.py
  File "counter-vertically.py", line 20
    print item
             ^
SyntaxError: invalid syntax

>
> --
>
> DaveA
>
>


-- 
Best Regards,

lina
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