Fun with Python dictionaries! Works on Python 2.7.x.

python.dict.fun.py

def flatten(obj, parent_key=None, sep='.'):
    """Flattens multi-level dictionary to a single-level dictionary.

    :param obj: Dictionary object to flatten.
    :type obj: dict
    :param parent_key: (optional) Prefix for the flattened key. (default: None)
    :type parent_key: basestring, str, or unicode
    :param sep: (optional) Separator for the nested key names. (default: '.')
    :type sep: basestring, str, or unicode
    :return: Sexy flattened dictionary.
    :rtype: dict
    """
    items = []
    for obj_key, obj_val in obj.items():
        obj_key = obj_key.replace(' ', '_')
        # obj_key = regex_non_alphanumeric_chars.sub('', obj_key)

        new_key = '{}{}{}'.format(parent_key, sep, obj_key) if parent_key else obj_key
        if isinstance(obj_val, dict):
            items.extend(flatten(obj_val, new_key, sep=sep).items())
        else:
            items.append([new_key, obj_val])
    return dict(items)