can split big files into smaller chunks easily with markers.

split.py

#!/usr/bin/env python

import sys

class Splitter(object):
    def __init__(self, resource):
        self.resource = resource
        self.file = open(resource, 'r')
        self.contents = self.file.read()

    def __del__(self):
        self.file.close()
        del self.resource, self.file, self.contents

    def expandTabs(self, do):
        self.expand = do

    def split(self):
        file = None
        for line in self.contents.splitlines():
            if line.lstrip().startswith('==!') and line.rstrip().endswith('!=='):
                if file is not None:
                    file.close()
                    del file
                file = open(line.split('!')[1], 'w+')
                print 'Processing data for [%s]' % (line.split('!')[1])
            else:
                if not file:
                    continue
                elif file:
                    if self.expand:
                        file.write(line.expandtabs(4) + '\n')
                    elif not self.expand:
                        file.write(line + '\n')

if __name__ == '__main__':
    resource = sys.argv[1]
    print 'Processing [%s]' % (resource)
    s = Splitter(resource)
    if 'extab' in sys.argv:
        print 'Tabs will be expanded to size: [4]'
        s.expandTabs(True)
    s.split()
    del s
    print 'Finished processing [%s]' % (resource)
    exit()