[Q] How to ignore the first line of the text read from a file

norseman norseman at hughes.net
Thu Aug 28 19:16:45 CEST 2008


Benjamin Kaplan wrote:
> On Thu, Aug 28, 2008 at 12:11 AM, youngjin.michael at gmail.com <
> youngjin.michael at gmail.com> wrote:
> 
>> Hello,
>>
>> I am new to Python and have one simple question to which I cannot find
>> a satisfactory solution.
>> I want to read text line-by-line from a text file, but want to ignore
>> only the first line. I know how to do it in Java (Java has been my
>> primary language for the last couple of years) and following is what I
>> have in Python, but I don't like it and want to learn the better way
>> of doing it.
>>
>> file = open(fileName, 'r')
>> lineNumber = 0
>> for line in file:
>>    if lineNumber == 0:
>>        lineNumber = lineNumber + 1
>>    else:
>>        lineNumber = lineNumber + 1
>>        print line
>>
>> Can anyone show me the better of doing this kind of task?
>>
>> Thanks in advance.
>>
>> --
> 
> 
> Files are iterators, and iterators can only go through the object once. Just
> call next() before going in the for loop. Also, don't use "file" as a
> variable name. It covers up the built-in type.
> 
> afile = open(file_name, 'r')
> afile.next() #just reads the first line and doesn't do anything with it
> for line in afile :
>    print line
> 
> 
>> http://mail.python.org/mailman/listinfo/python-list
>>
> 
> 
> ------------------------------------------------------------------------
> 
> --
> http://mail.python.org/mailman/listinfo/python-list

==================
actually:
import os

file = open(filename, 'r')
for line in file:
   dummy=line
   for line in file:
     print line


is cleaner and faster.
If you need line numbers, pre-parse things, whatever, add where needed.

Steve
norseman at hughes.net



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