column selection

[Dave Angel]

Dave Angel wrote:
> <div class="moz-text-flowed" style="font-family: -moz-fixed">mannu jha 
> wrote:
>> I tried with this:
>>
>> for line in open('1.txt'):
>>        columns = line.split()
>>        print columns[0], columns[1]
>>        if not line: continue
>>
>> but it is showing error:
>>
>> nmruser at caf:~> python split.py
>> 24 ALA
>> Traceback (most recent call last):
>>   File "split.py", line 3, in     print columns[0], columns[1]
>> IndexError: list index out of range
>> nmruser at caf:~>
>>
>> Thanks,
>>
>> On Thu, 06 May 2010 15:44:07 +0530  wrote
>>   <snip>
>>
>> If your files have two blank lines between each useful line, you have to
>> do something to avoid trying to print those items for the blank lines.
>> Depending how sure you are about your formatting, you could either do a
>>
>>   if not line: continue
>>
>> or a
>>
>>    if columns < 3: continue
>>
>>
>> DaveA
>>
>>
>>   
> (Don't top-post.  It makes the message very confusing to someone else 
> trying to follow it.  Also, enable your mail program's quoting feature 
> -- currently it's not adding the marks at the beginning of each line 
> you quote.)
>
> If you're going to skip over blank lines, it'd be good to do it before 
> trying to print from it.  Move the test up by a line.
>
> DaveA
>
for line in open('1.txt'):
       columns = line.split()
       if len(columns) < 2:
              continue                            #skip over lines that 
don't have at least 2 columns
       print columns[0], columns[1]

DaveA