A helper for converting dictionary keys between camel and snake case

case_converter.py

import re


def snake_case_to_camel_case(val):
    return converter(val, snake_case_to_camel_case, snake_to_camel)


def camel_case_to_snake_case(val):
    return converter(val, camel_case_to_snake_case, camel_to_snake)


def converter(val, dict_method, str_method):
    return {
        str_method(k):
            converter(v, dict_method, str_method) if isinstance(v, dict) else v
        for (k, v) in val.items()
    }


def snake_to_camel(text):
    return re.sub('_([a-zA-Z0-9])', lambda m: m.group(1).upper(), text)


def camel_to_snake(text):
    s1 = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', text)
    return re.sub('([a-z0-9])([A-Z])', r'\1_\2', s1).lower()