def _to_python(input_string):
    """ a helper method to convert camelcase to python"""
    python_string = ''
    for i in range(len(input_string)):
        if not python_string:
            python_string += input_string[i].lower()
        elif input_string[i].isupper():
            python_string += '_%s' % input_string[i].lower()
        else:
            python_string += input_string[i]
    return python_string
