Fixed issue 51

from fractions import Fraction

from collections import abc

# HANDLE THE DEFAULT CONFIGURATION FILE

HERE = os.path.abspath(os.path.dirname(__file__))

DEFAULT_CONFIG_PATH = os.path.join(HERE, 'microscoperc.default.yaml')

with open(DEFAULT_CONFIG_PATH, 'r') as default_rc:

    DEFAULT_CONFIG = default_rc.read()

JSON_TYPE_TABLE = {

# HANDLE CUSTOM YAML PARSING

def construct_yaml_bool(self, node):

    """

    Override PyYAML constructors handling of bools.

    YAML otherwise caused grief for picamera properties where 'off' is a valid string value.

    """

    override_bool_values = {

            'yes':      True,

            'no':       False,

            'true':     True,

            'false':    False,

            'on':       'on',

            'off':      'off',

    }

    value = self.construct_scalar(node)

    return override_bool_values[value.lower()]

yaml.Loader.add_constructor(u'tag:yaml.org,2002:bool', construct_yaml_bool)

# HANDLE CONVERTING ARBITRARY CONFIG TO JSON-SAFE JSON

def json_convert(v):

    """Make an individual attribute JSON-safe"""

    return to_map(d, json_convert)

# HANDLE BASIC LOADING AND SAVING OF YAML FILES

def load_yaml_file(config_path) -> dict:

    """

        with open(config_path, 'w') as outfile:

            outfile.write(populate)

# MAIN CONFIG CLASS

class OpenflexureConfig:

    """