convert INI file to json, skipping all garbage data

ini2json_relaxed.py

# -*- coding: utf-8 -*-
import json
import sys
import re
from configparser import (ConfigParser, MissingSectionHeaderError,
                          ParsingError, DEFAULTSECT)


def isIniLine(line):
    #filter for lines with
    # [section]
    # name = value and more blah
    #
    # multiline/line continuation is not supported
    header = re.compile("\[.+\]")
    value = re.compile("[a-zA-Z0-9_]+\s*=\s*\S+")
    return header.match(line) or value.match(line)

if __name__ == "__main__":
    if len(sys.argv) > 1:
        f = open(sys.argv[1])
    else:
        f = sys.stdin
    lines = f.readlines()
    f.close()

    filtered=filter(isIniLine,lines)

    cfg = ConfigParser()
    cfg.readfp(filtered)
    config = {}

    for section in cfg.sections():
        config[section] = {}
        for name, value in cfg.items(section):
            config[section][name] = [x.strip() for x in value.split() if x]
            if len(config[section][name]) == 1:
                config[section][name] = config[section][name][0]
            elif len(config[section][name]) == 0:
                config[section][name] = ''

    print (json.dumps(config))