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info line i
info line j
data line k
data line l

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awk '/data/,//' file.dat > data.dat
mv data.dat file.dat

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awkCmd = '/data/,//'
target = open('file.dat', 'r')
awkp = subprocess.Popen(['awk', awkCmd],
        stdin=target,
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE,
        shell=False)
# Opening the 'data'-only file.
dataFile = open('data.tmp', 'w')
dataFile.write(awkp.stdout.read())
dataFile.close()
mvp = subprocess.Popen(['mv',
        'data.tmp',
        'file.dat'])

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In [12]: f = """info line Info i
info line Info j
data line data k
data line data l"""

In [16]: lines = f.split('\n')

In [17]: filter(lambda l: l.startswith("data"), lines)
Out[17]: [u'data line data k', u'data line data l']

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grep "data" file.dat

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#!/usr/bin/env python
# coding: iso-8859-1

f = """info line Info i
info line Info j
data line data k
data line data l"""

lines = f.split('\n')

for i in lines:
    if i.startswith("data"):
        print i

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Python 2.4.3 (#2, Jan 21 2010, 19:56:43) 
[GCC 4.0.3 (Ubuntu 4.0.3-1ubuntu5)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> print filter.__doc__
filter(function or None, sequence) -> list, tuple, or string

Return those items of sequence for which function(item) is true.  If
function is None, return the items that are true.  If sequence is a tuple
or string, return the same type, else return a list.
>>> 

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python -c 'import sys;[sys.stdout.write(l) for l in sys.stdin if l.startswith("data")]' < test.dat