Determine depth of data structure in Python. This recursive function will return the depth as an integer of the deepest-nested object.

depth.py

def depth(data):
    d = 1 
    if type(data) is dict:
        for item in data.keys():
            if type(data[item]) is dict or type(data[item]) is list:
                d += depth(data[item])
    elif type(data) is list:
        for item in data:
            if type(item) is dict or type(item) is list:
                d += depth(item)
    return d