manipulate variables in a function in python

Question

comp_sc = 0
game_start = False

def main():
    turn_start = input('Are you Ready to play? ').lower()
    if turn_start == 'n':
        game_start = False
        print('No one is willing to play!!!')
    if turn_start == 'y':
        game_start = True

    #while game_start == True:
    for x in range(1, 5):
        com_move(comp_sc)

def roll():
    ***


def com_move(comp_sc):
    turn_score = int(roll())
    if turn_score < 6:
        comp_sc =+ turn_score
        print(comp_sc, 'comp_sc')
    elif turn_score == 6:
        comp_sc =+ 0
        game_start = False
    return comp_sc

in my com_move function, I don't see turn_score (which is outputting a random number through random module) adding it in comp_sc variable. when I run this function - comp_sc is always equal to turn_score - instead of adding up all the 5 turn_score in it.

Thank you

Use the global keyword to write to global variables.

MisterMiyagi
– MisterMiyagi

2021-09-11 18:02:16 +00:00
Commented Sep 11, 2021 at 18:02 — MisterMiyagi
– MisterMiyagi, Commented Sep 11, 2021 at 18:02
Use += and not =+ to add to computer_score

not_speshal
– not_speshal

2021-09-11 18:05:27 +00:00
Commented Sep 11, 2021 at 18:05 — not_speshal
– not_speshal, Commented Sep 11, 2021 at 18:05

Mureinik · Accepted Answer · 2021-09-11 18:02:32Z

2

computer_score is a local variable inside the computer_move function. You are doing the correct thing by returning it, but then you just ignore this return value. Instead, you could assign it back to the computer_score variable in the calling function:

for x in range(1, 5):
    computer_score = computer_move(computer_score, human_score)

answered Sep 11, 2021 at 18:02

Mureinik

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Comments

ph140 · Accepted Answer · 2021-09-11 18:04:27Z

1

It is because you write computerscore =+ turnscore which is setting computerscore to the positive value of turnscore, so they will always be the same.

The right way would be to write computerscore += turnscore which will add the turnscore to the computerscore.

answered Sep 11, 2021 at 18:04

ph140

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