camel_to_snake.py

def camel_to_snake(column_name):
    """
    converts a string that is camelCase into snake_case
    Example:
        print camel_to_snake("javaLovesCamelCase")
        > java_loves_camel_case
    See Also:
        http://stackoverflow.com/questions/1175208/elegant-python-function-to-convert-camelcase-to-camel-case
    """
    s1 = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', column_name)
    return re.sub('([a-z0-9])([A-Z])', r'\1_\2', s1).lower()