import re
import json
import os


def read_json(file_path):
    try:
        with open(file_path, 'r') as f:
            try:
                return json.load(f)
            except ValueError:
                raise ValueError('{} is not valid'.format(file_path))
    except IOError:
        raise IOError('{} does not exist.'.format(file_path))


def write_json(obj, file_path):
    make_directory(os.path.dirname(file_path))
    with open(file_path, 'w') as f:
        json.dump(obj, f)


def digits_in_string(text):
    non_digit = re.compile("\D")
    return int(non_digit.sub("", text))


def make_directory(directory):
    if not os.path.exists(directory):
        try:
            os.makedirs(directory)
        except OSError as err:
            raise

    return directory