Dictionary to lowercase in Python

Question

I wish to do this but for a dictionary:

\"My string\".lower()

Is there a built in function or should I use a loop?

Answer 1

def convert_to_lower_case(data):
    if type(data) is dict:
        for k, v in data.iteritems():
            if type(v) is str:
                data[k] = v.lower()
            elif type(v) is list:
                data[k] = [x.lower() for x in v]
            elif type(v) is dict:
                data[k] = convert_to_lower_case(v)
    return data