checkkconfigsymbols.py: fix pylint and pep8 warnings

import subprocess

import sys

from multiprocessing import Pool, cpu_count

from subprocess import Popen, PIPE, STDOUT

# regex expressions

    """Main function of this module."""

    args = parse_options()

    global color

    color = args.color and sys.stdout.isatty()

    global COLOR

    COLOR = args.color and sys.stdout.isatty()

    if args.sim and not args.commit and not args.diff:

        sims = find_sims(args.sim, args.ignore)

        # report cases that are present for the commit but not before

        for feature in sorted(undefined_b):

            # feature has not been undefined before

            if not feature in undefined_a:

            if feature not in undefined_a:

                files = sorted(undefined_b.get(feature))

                undefined[feature] = files

            # check if there are new files that reference the undefined feature

    """

    Color %string yellow.

    """

    return "\033[33m%s\033[0m" % string if color else string

    return "\033[33m%s\033[0m" % string if COLOR else string

def red(string):

    """

    Color %string red.

    """

    return "\033[31m%s\033[0m" % string if color else string

    return "\033[31m%s\033[0m" % string if COLOR else string

def execute(cmd):

    for res in pool.map(parse_source_files, arglist):

        referenced_features.update(res)

    # parse kconfig files

    arglist = []

    for part in partition(kconfig_files, cpu_count()):

        lines = stream.readlines()

    for line in lines:

        if not "CONFIG_" in line:

        if "CONFIG_" not in line:

            continue

        features = REGEX_SOURCE_FEATURE.findall(line)

        for feature in features: