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

Love the way you can use multilevel functions, here's my way of lowercase-ing the keys

def to_lower(dictionary):

    def try_iterate(k):
        return lower_by_level(k) if isinstance(k, dict) else k

    def try_lower(k):
        return k.lower() if isinstance(k, str) else k

    def lower_by_level(data):
        return dict((try_lower(k), try_iterate(v)) for k, v in data.items())

    return lower_by_level(dictionary)