[Python] How do I define two mutually dependent parameters in Python?

I want to create a Python class with two mutually inclusive parameters that are dependent on each other. The user must either provide a value for both parameters or neither. If one parameter is specified without the other, an exception should be raised.

class TestEvent:
def __init__(self, start_date = None, end_date = None , **kwargs):
# Check if start_date and end_date are defined
pass

valid_event_1 = TestEvent()
valid_event_2 = TestEvent(start_date = '2022-07-01', end_date = '2022-08-01')
invalid_event_1 = TestEvent(start_date = '2022-07-01') # Raise exception
invalid_event_2 = TestEvent(end_date = '2022-08-01') # Raise exception


How can I define two mutually dependent parameters in Python?

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