Replace keys in underscore lowercase convention for camel case convention and vice versa.

name_conventions_dictionaries.py

def camel_to_underscore(name):
    """
    Convert a name from camel case convention to underscore lower case convention.
    Args:
        name (str): name in camel case convention.
    Returns:
        name in underscore lowercase convention.
    """
    camel_pat = compile(r'([A-Z])')
    return camel_pat.sub(lambda x: '_' + x.group(1).lower(), name)


def underscore_to_camel(name):
    """
    Convert a name from underscore lower case convention to camel case convention.
    Args:
        name (str): name in underscore lowercase convention.
    Returns:
        Name in camel case convention.
    """
    under_pat = compile(r'_([a-z])')
    return under_pat.sub(lambda x: x.group(1).upper(), name)


def change_dict_naming_convention(d, convert_function):
    """
    Convert a nested dictionary from one convention to another.
    Args:
        d (dict): dictionary (nested or not) to be converted.
        convert_function (func): function that takes the string in one convention and returns it in the other one.
    Returns:
        Dictionary with the new keys.
    """
    new = {}
    for k, v in d.iteritems():
        new_v = v
        if isinstance(v, dict):
            new_v = change_dict_naming_convention(v, convert_function)
        elif isinstance(v, list):
            new_v = list()
            for x in v:
                new_v.append(change_dict_naming_convention(x, convert_function))
        new[convert_function(k)] = new_v
    return new

I added this check for the case when a list inside that dictionary doesn't contain a dictionary but only number or string.

if not (isinstance(d, dict) or isinstance(d, list)):
    return dict_input