CODEWITHSUNDEEP
python
boson
boson

Reputation: 894

Rolling a dice in python n times

I'd like to create code that will 'roll' number_of_dice times and find the sum of the rolls. This is what I have. I'm getting an error when I do "sum = sum + roll" that there's unsupported operand types for +: built_in_function_or_method and int. How can I solve this?

for i in range(0,number_of_dice):
    roll = random.randint(1,number_of_sides + 1)
    sum = sum + roll
    return sum

Upvotes: 1

Views: 7751

Answers (2)

Ben Golding
Ben Golding

Reputation: 776

I'd use:

import random

def sum_of_dice(number_of_dice, n_sides_on_die=6):
    return sum([random.choice(range(1, n_sides_on_die + 1))
                for i in range(number_of_dice)])

Upvotes: 0

taskinoor
taskinoor

Reputation: 46027

Python has a built in function sum that returns the sum of numbers given as a sequence. Since you have not declared a variable sum it is trying to + that built in function and a number roll which is not permitted. You need to define the variable before the loop:

sum = 0
for i in range(0,number_of_dice):
    roll = random.randint(1,number_of_sides + 1)
    sum = sum + roll

return sum

Note that you are supposed to return after the loop, not from inside the loop. Also, if you don't want to shadow the built in function sum then you can use a different name for your variable.

Upvotes: 2

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