key_depth.py

# check depth of keys
#
a = {
    'key1': 1,
    'key2': {
        'key3': 1,
        'key4': {
            'key5': 4
        }
    }
}

def print_depth(data, depth=0, key=''):
    '''print key and depth'''
    try:
       data.keys()
    except:
        print key, depth
        return depth
    if key:
        print key, depth
    return [print_depth(data[k], depth+1, k) for k,v in data.iteritems()]

print_depth(a)