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Date: Sun, 22 Jan 2012 15:39:54 +0000
Subject: Re: Splitting a file from specific column content
From: Arnaud Delobelle <arnodel@gmail.com>
To: python-list@python.org
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:19216

On 22 January 2012 15:19, MRAB <python@mrabarnett.plus.com> wrote:

> Here's a solution in Python 3:
>
> input_path =3D "..."
> section_1_path =3D "..."
> section_2_path =3D "..."
> section_3_path =3D "..."
>
> with open(input_path) as input_file:
> =C2=A0 =C2=A0try:
> =C2=A0 =C2=A0 =C2=A0 =C2=A0line =3D next(input_file)
>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0# Copy section 1.
> =C2=A0 =C2=A0 =C2=A0 =C2=A0with open(section_1_path, "w") as output_file:
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0while line[0] < "3":
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0output_file.write(=
line)
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0line =3D next(inpu=
t_file)
>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0# Copy section 2.
> =C2=A0 =C2=A0 =C2=A0 =C2=A0with open(section_2_path, "w") as output_file:
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0while line[5] < "5":
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0output_file.write(=
line)
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0line =3D next(inpu=
t_file)
>
> =C2=A0 =C2=A0 =C2=A0 =C2=A0# Copy section 3.
> =C2=A0 =C2=A0 =C2=A0 =C2=A0with open(section_3_path, "w") as output_file:
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0while True:
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0output_file.write(=
line)
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0line =3D next(inpu=
t_file)
> =C2=A0 =C2=A0except StopIteration:
> =C2=A0 =C2=A0 =C2=A0 =C2=A0pass
> --
> http://mail.python.org/mailman/listinfo/python-list

Or more succintly (but not tested):


sections =3D [
    ("3", "section_1")
    ("5", "section_2")
    ("\xFF", "section_3")
]

with open(input_path) as input_file:
    lines =3D iter(input_file)
    for end, path in sections:
        with open(path, "w") as output_file:
            for line in lines:
                if line >=3D end:
                    break
                output_file.write(line)

--=20
Arnaud