Python 3 Json with 2 decimals after comma

my_json_dums.py

# We need to ensure that c encoder will not be launched
@patch('json.encoder.c_make_encoder', None)
def json_dumps_with_two_digit_float(some_object):
    # saving original method
    of = json.encoder._make_iterencode
    def inner(*args, **kwargs):
        args = list(args)
        # fifth argument is float formater which will we replace
        args[4] = lambda o: '{:.2f}'.format(o)
        return of(*args, **kwargs)
    
    with patch('json.encoder._make_iterencode', wraps=inner):
        return json.dumps(some_object)