Python editing .txt file

[187braintrust at berkeley.edu]

>
> From: MRAB <python at mrabarnett.plus.com>
> To: python-list at python.org
> Date: Wed, 16 Jun 2010 03:06:58 +0100
> Subject: Re: Python editing .txt file
> 187braintrust at berkeley.edu wrote:
>
>> I am trying to write a program in Python that will edit .txt log files
>> that contain regression output from R.  Any thoughts or suggestions would be
>> greatly appreciated.
>>
>
> How's this:
>
> input_file = open(input_path)
> output_file = open(output_path, "w")
> for line in input_file:
>    if line.startswith("factor("):
>        open_paren = line.find("(")
>        close_paren = line.find(")")
>        variable = line[open_paren + 1 : close_paren]
>        output_file.write("*** Factors for %s ***\n" % variable)
>        prefix = line[ : close_paren + 1]
>        while line.startswith(prefix):
>            line = input_file.readline()
>    output_file.write(line)
> input_file.close()
> output_file.close()


Thank you very much for your reply.  This code works perfectly, except that
the "line = input_file.readline()" part causes an error: "ValueError: Mixing
iteration and read methods would lose data."  I've been working on figuring
out a work around.  Do you have any ideas?
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