Why doesn't the if statement execute?

Question

https://github.com/gabrirm/python-roulette-game.git

if betType == "red" and bet in red == True:
    self.balance += betprice[0] * 2
else:
    self.balance -= betprice[0]
    print("Oh, the ball landed on a black number :(. This is your current balance: ".format(self.balance))

if betType == "black" and bet in black == True:
    self.balance += betprice[0] * 2
else:
    self.balance -= betprice[0]
    print("Oh, the ball landed on a red number :(. This is your current balance: ".format(self. Balance))

So in this piece of code, when the user types 'red', why does the else statement keep executing, even though betType == 'red' and bet in red == True? both parts are true right? the else shouldn't execute.

What is red or black? This might be helpful: docs.python.org/3/reference/… — pho
– pho, Commented Aug 31, 2022 at 18:18
@KellyBundy I realized that was wrong, so edited my comment. Also, what I had before barely qualifies as an answer. — pho
– pho, Commented Aug 31, 2022 at 18:22
It might not have been nice as an answer, but you were clearly answering. — Kelly Bundy
– Kelly Bundy, Commented Aug 31, 2022 at 18:29

S.B · Accepted Answer · 2022-08-31 18:40:49Z

1

From documentation:

If A, B and C are operands and x is a comparison operator, then:

A x B x C is equivalent to:

(A x B) and (B x C)

You have this situation in this part: bet in red == True

So now this line:

betType == "red" and bet in red == True

is actually:

(betType == "red") and (bet in red) and (red == True)

From this table, both == and in are comparison operators.

If you want your condition to work as expected put parenthesis around the membership testing like: (bet in red) == True or better is to leave it like bet in red. That's it. No need to compare to True:

betType == "red" and bet in red

edited Aug 31, 2022 at 18:40

answered Aug 31, 2022 at 18:22

S.B

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1 Comment

Gabriel Rodríguez Over a year ago

You are right, but I wrote that in an attempt to solve the issue, I previously had: and bet in red', but didn't work either... I guess it is a syntax problem when getting the value of betType from the user's input. That's my shot, but I certainly can't identify the problem. Thank you so much anyway :)

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