How to sum an output in Python

Question

The program below will create a list of 100 numbers chosen randomly between 1-10. I need help to then sum the list, then average the list created.

I have no idea how to begin and since I'm watching videos online I have no person to turn to. I'm very fresh in this world so I may just be missing entire ideas. I would doubt that I don't actually know enough though because the videos I paid for are step by step know nothing to know something.

Edit: I was informed that what the program does is overwrite a variable, not make a list. So how do I sum my output like this example?

This is all I have to go on:

all I have to go on

Code:

import random

x=0
while x < 100:
    mylist = (random.randrange(1,10))
    print(mylist) 
    x = x+1

No it won't create a list, it will override the same variable you called mylist again and again with a random number — Nir Alfasi
– Nir Alfasi, Commented Dec 15, 2017 at 6:31

Sqoshu · Accepted Answer · 2017-12-15 08:46:57Z

1

I think the shortest and pythonic way to do this is:

import random
x = [random.randrange(1,10) for i in range(100)] #list comprehension
summed = sum(x)                                  #Sum of all integers from x
avg = summed / len(x)                            #Average of the numbers from x

In this case this shouldn't have a big impact, but you should never use while and code manual counter when you know how many times you want to go; in other words, always use for when it's possible. It's more efficient and clearer to see what the code does.

answered Dec 15, 2017 at 8:46

Sqoshu

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Comments

Bakhrom Rakhmonov · Accepted Answer · 2017-12-15 06:31:03Z

0

def sum(list):
    sm = 0
    for i in list:
        sm+=i
    return sm

Just run sum(list) to get sum of all elements

Or you can use

import random
x=0
mylist = []
sm = 0
while x < 100:
     mylist.append(random.randrange(1,10))
     sm += mylist[x]
     x += 1

Then sm will be sum of list

answered Dec 15, 2017 at 6:31

Bakhrom Rakhmonov

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Comments

Sumit S Chawla · Accepted Answer · 2017-12-15 06:38:55Z

0

The code is not correct. It will not create a list but generate a number everytime. Use the below code to get your desired result.

import random
mylist = []
for x in range(100):
    mylist.append(random.randrange(1,10))
print(mylist)   
print(sum(mylist))

OR

import random
mylist = [random.randrange(1,10) for value in range(100)]
print(mylist)   
print(sum(mylist))

Output:

[3, 9, 3, 1, 3, 5, 8, 8, 3, 3, 1, 2, 5, 1, 2, 1, 4, 8, 9, 1, 2, 2, 4,
 6, 9, 7, 9, 5, 4, 5, 7, 7, 9, 2, 5, 8, 2, 4, 3, 8, 2, 1, 3, 4, 2, 2,
 2, 1, 6, 8, 3, 2, 1, 9, 6, 5, 8, 7, 7, 9, 9, 9, 8, 5, 7, 9, 4, 9, 8, 
 7, 5, 9, 2, 6, 8, 8, 3, 4, 8, 4, 7, 9, 9, 4, 2, 9, 9, 6, 3, 4, 9, 5, 
 3, 8, 4, 1, 1, 3, 2, 6]

 512

edited Dec 15, 2017 at 6:38

answered Dec 15, 2017 at 6:33

Sumit S Chawla

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1 Comment

xaav Over a year ago

List comprehension is better.

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