Print webcam spec using v4l2 command

print_webcam_spec.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

""" Tag auth """

from __future__ import print_function
import commands
import re

def v4l2_ctl(options):
    """Run v4l2"""
    status, output = commands.getstatusoutput('v4l2-ctl '+ options)
    if status is not 0:
        raise Exception

    # print(output)
    lines = output.split('\n')
    return [[kv.strip() for kv in line.split(':')] for line in lines]

def parse_controls(items):
    """Parse v4l2 control"""
    for item in items:
        print('- ' + item[0])

def parse_formats(items):
    """Parse v4l2 format"""

    # Find (*)
    parens = re.compile(r"\(.+?\)")
    parsing_interval = False

    for item in items:
        # print(item)
        if item[0] == 'Pixel Format':
            if parsing_interval:
                print('|')
            parsing_interval = False
            print('\n__{}__\n'.format(item[1]))
            print('| Size | FPS |\n|---|---|')
        elif item[0] == 'Size':
            if parsing_interval:
                print('|')
                parsing_interval = False
            print('|{} |'.format(item[1].translate(None, 'Discrete')), end='')
        elif item[0] == 'Interval':
            res = parens.search(item[1]).group(0)
            res = res.translate(None, '(').translate(None, ' fps)')
            if parsing_interval:
                print(', {}'.format(res), end='')
            else:
                print('{}'.format(res), end='')
            parsing_interval = True
    print('|\n')


def main():
    """Main function"""
    print('### Controls')
    result = v4l2_ctl('--list-ctrls')
    parse_controls(result)

    print('\n\n### Formats')
    result = v4l2_ctl('--list-formats-ext')
    parse_formats(result)

if __name__ == '__main__':
    main()