class StrangeFileWorker(object):
    def __init__(self):
        self._sections = dict()

    def load_file(self, file_name):
        with open(file_name) as fd:
            self.load_string(fd.read())

    def load_string(self, data):
        cur_key = None
        lines = data.split('\n')
        for ln in lines:
            if not ln:
                continue
            if ln.endswith(':'):
                cur_key = ln.strip(':')
                self._sections[cur_key] = list()
            elif cur_key is not None:
                self._sections[cur_key].append(ln)

    def __getitem__(self, key):
        return self._sections[key]

    def __delitem__(self, key):
        del self._sections[key]

    def __repr__(self):
        return '\n'.join(['%s:\n%s\n' % (k, '\n'.join(v)) for k,v in self._sections.iteritems()])

if __name__ == '__main__':
    sfw = StrangeFileWorker()

    print 'Loading file...'
    sfw.load_file('test_input')
    print 'Got:'
    print sfw
    print 'NameTable1 contains:'
    print sfw['NameTable1']
    print 'Adding value RegExpN2 to NameTable1'
    sfw['NameTable1'].append('RegExpN2')
    print 'Got:'
    print sfw
    print 'Writing result to file'
    with open('test_output', 'w') as fd:
        fd.write(repr(sfw))

def replaceAll(file,searchExp,replaceExp):
    for line in fileinput.input(file, inplace=1):
        if searchExp in line:
            line = line.replace(searchExp,replaceExp)
        sys.stdout.write(line)

sfw['NameTable0'].remove('re3')

del sfw['NameTable0']