Cannot update dictionary

I have a dict_ class that attempts to copy the built-in dict class.

Here is that class (the new function returns the original object):

class dict_:
    def __init__(self, *args, **kwargs):
        self.kv = kwargs

        if not self.kv:
            for kv in args:
                for k, v in kv:
                    self.kv.update({k: v})

    def __str__(self):
        return "%s" % self.kv

    def __getitem__(self, item):
        return self.kv[item]

    def update(self, *args):

I've called it like this:

from Dodger.dodger import *

term = new(System())
a = new(dict_(a=1, b=2))

This is supposed to modify a to {"a": 1, "b": 2, "c": 3} but instead it gives me this error:

Traceback (most recent call last):
  File "C:/free_time/Dodger/", line 5, in <module>
  File "C:\free_time\Dodger\", line 176, in update
  File "C:\free_time\Dodger\", line 173, in __getitem__
KeyError: 0

Why is it giving a KeyError? What does the 0 mean? (I am using python 3.8.2)

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