How do I get a total sum using a for loop of 100 numbers?

[BillMeehan]

I need to use a for loop with the range function to roll the dice 100 times and have a total sum as well as a sum of 2 dice rolls that starts at 0 and shows the total sum after all 100 rolls. I have this so far:

import random
 
def diceroll():
    r = random.random()
 
    if r < 1.0/6:
        r = 1
    elif r < 2.0/6:
        r = 2
    elif r < 3.0/6:
        r = 3
    elif r < 4.0/6:
        r = 4
    elif r < 5.0/6:
        r = 5
    else:
        r = 6
 
    return r
 
for r in range(100):
    d1 = diceroll()
    d2 = diceroll()
    sum = d1 + d2
    print d1,
    print d2,
    print sum

[shonen]

for r in range(100):
    d1 = diceroll()
    d2 = diceroll()
    sum = d1 + d2
    print d1
    print d2
    print sum
 

Ok well let's check out your code here, (cause this is where you need to check it)

you're calling your diceroll 100 times BUT because python overwrites your variables, you're basically overwriting your variable sum 100 times and then printing it out. (we've all made this mistake)

now what i did just now on my linux system was this

 
sum=0
for i in range(100):
     sum += 1
 
print sum
 

so this made sum 100(counted from 0 to 100). See you have to add to your variable as you go along...not just set it equal to. so for you...

 
for r in range(100):
     d1=diceroll()
     d2=diceroll()
     sum += (d1 + d2) # Add these two first, then add them to the sum
     print d1
     print d2
     print sum
 

Hopefully, that makes sense :D

~shonen

[bvdet]

I need to use a for loop with the range function to roll the dice 100 times and have a total sum as well as a sum of 2 dice rolls that starts at 0 and shows the total sum after all 100 rolls. I have this so far:

import random

def diceroll():
r = random.random()

if r < 1.0/6:
r = 1
elif r < 2.0/6:
r = 2
elif r < 3.0/6:
r = 3
elif r < 4.0/6:
r = 4
elif r < 5.0/6:
r = 5
else:
r = 6

return r

for r in range(100):
d1 = diceroll()
d2 = diceroll()
sum = d1 + d2
print d1,
print d2,
print sum

Since this looks like homework, I will show you some hints toward a better solution.

>>> import random
>>> diceLst = [1,2,3,4,5,6]
>>> roll = random.choice(diceLst), random.choice(diceLst)
>>> sum(roll)
6
>>> roll
(4, 2)

[bartonc]

I need to use a for loop with the range function to roll the dice 100 times and have a total sum as well as a sum of 2 dice rolls that starts at 0 and shows the total sum after all 100 rolls. I have this so far:

import random
 
def diceroll():
    r = random.random()
 
    if r < 1.0/6:
        r = 1
    elif r < 2.0/6:
        r = 2
    elif r < 3.0/6:
        r = 3
    elif r < 4.0/6:
        r = 4
    elif r < 5.0/6:
        r = 5
    else:
        r = 6
 
    return r
 
for r in range(100):
    d1 = diceroll()
    d2 = diceroll()
    sum = d1 + d2
    print d1,
    print d2,
    print sum

I like this die roller better:

from random import choice
die = [a for a in range(1, 7)]
print die
 
def roledie():
    return choice(die)
 
 
print roledie()
 

[bartonc]

Since this looks like homework, I will show you some hints toward a better solution.

>>> import random
>>> diceLst = [1,2,3,4,5,6]
>>> roll = random.choice(diceLst), random.choice(diceLst)
>>> sum(roll)
6
>>> roll
(4, 2)

Sorry, BV. I was composing while you were posting. Didn't mean to step on your hints.
Thank you for being aware of Posting Guidelines re. homework. And thank you so much for all the time you give to our members.

[dshimer]

This is off subject, but wouldn't random.randint( 1,6) be the easiest way to get a die? I use randint() on occaision and when it didn't get mentioned it made me wonder if there are issues.

[ghostdog74]

This is off subject, but wouldn't random.randint( 1,6) be the easiest way to get a die? I use randint() on occaision and when it didn't get mentioned it made me wonder if there are issues.

there's a difference. you can use randint only for integers. choice() is used on a sequence, where a sequence can be a mix of data types something like this

>>> random.choice([1,2,3,'test'])
1
>>> random.choice([1,2,3,'test'])
'test'
>>>
 

however , in this die rolling case, randint() can also be used since what we want is integers.

[BillMeehan]

I need to make a total sum variable for rolling two dice in python and am not sure how to do so.

import random
 
def diceroll():
    r = random.random()
 
    if r < 1.0/6:
        r = 1
    elif r < 2.0/6:
        r = 2
    elif r < 3.0/6:
        r = 3
    elif r < 4.0/6:
        r = 4
    elif r < 5.0/6:
        r = 5
    else:
        r = 6
 
    return r
 
for r in range(100):
    d1 = diceroll()
    d2 = diceroll()
    sum = d1 + d2
    print d1,
    print d2,
    print sum

[bartonc]

I need to make a total sum variable for rolling two dice in python and am not sure how to do so.

import random
 
def diceroll():
    r = random.random()
 
    if r < 1.0/6:
        r = 1
    elif r < 2.0/6:
        r = 2
    elif r < 3.0/6:
        r = 3
    elif r < 4.0/6:
        r = 4
    elif r < 5.0/6:
        r = 5
    else:
        r = 6
 
    return r
 
for r in range(100):
    d1 = diceroll()
    d2 = diceroll()
    sum = d1 + d2
    print d1,
    print d2,
    print sum

I have merged you posts which are on a single topic and added CODE tags to your recent post. There are Posting Guidelines all over the place, so that you may learn proper forum posting prectices. Please take some time to read them.
That said, in reply to "I can't understand...":

total = 0
for r in range(100):
    d1 = diceroll()
    d2 = diceroll()
    sum = d1 + d2
    total += sum
    print d1,
    print d2,
    print sum
print total