Quick and dirty recursive dict lowercaser

lowercaser.py

import json

"""
This is NOT extensive in any way -- just something quick and dirty. It doesn't handle all datatypes -- use at your own risk.
"""
def lowercase(original):
    if isinstance(original, str):
        return original.lower()

    elif isinstance(original, list):
        new_list = []

        for item in original:
            new_list.append(lowercase(item))

        return new_list

    elif not original:
        return None

    # Catch-all? Hopefully? Maybe?
    elif not isinstance(original, dict):
        return original

    staging_dict = {}

    for item, data in original.iteritems():
        lower_cased = lowercase(data)
        staging_dict[item.lower()] = lower_cased

    return staging_dict

asdf = {
    "SomeValue": "IsThis",
    "SeCondV": "SoemthingElse",
    "Third": {
        "Nested": {
            "AnotherNested": "One",
            "Two": "AnotherNested"
        },
        "Three": "Four"
    },
    "Fourth": {
        "Some Value": [
            "One",
            "twO",
            {
                "Three": "Four",
                "Five": [
                    "6",
                    "7",
                    "8",
                    9,
                    10,
                    True,
                    -10202.33982
                ]
            }
        ]
    },
    "Fifth": None
}

'''
Outputs:
$ python lowercaser.py 
{
    "third": {
        "three": "four", 
        "nested": {
            "anothernested": "one", 
            "two": "anothernested"
        }
    }, 
    "somevalue": "isthis", 
    "secondv": "soemthingelse", 
    "fifth": null, 
    "fourth": {
        "some value": [
            "one", 
            "two", 
            {
                "five": [
                    "6", 
                    "7", 
                    "8", 
                    9, 
                    10, 
                    true, 
                    -10202.33982
                ], 
                "three": "four"
            }
        ]
    }
}
'''