Using or in if statement (Python)

You can't use it like that. The or operator must have two boolean operands. You have a boolean and a string. You can write

weather == "Good!" or weather == "Great!": 

or

weather in ("Good!", "Great!"): 

Especially in the case of python, non empty strings evaluate to True, so

weather == "Good" or "Great":

will always be true, because "Great" is always true, making it a difficult mistake to spot.