🔒 help

[slow zodiac]

can somone explain to me about prefix sum?

[knotty knoll]

@slow zodiac

Python help channel opened

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[final apex]

Wdym by prefix sum

[lime trench]

These?: https://en.wikipedia.org/wiki/Prefix_sum

[visual tendon]

by itself, it's not too interesting (the i'th prefix sum of some sequence is just the sum of the first i elements)
where did you see it?

[tepid pulsar]

Prefix sum aka cumulative sum aka cumsum

[final apex]

Already searched it lol

[slow zodiac]

ye

i need python code of it

can u help

[slow zodiac]

can u give me a python code of it?

i need for my exam

[visual tendon]

we don't really code for people here, but it shouldn't be too hard given you understand the definition

[slow zodiac]

i'm not good at understanding explainations 😭

[rocky oar]

!rule 8

[knotty knoll]

Rules

8. Do not help with ongoing exams. When helping with homework, help people learn how to do the assignment without doing it for them.

[slow zodiac]

i need help to understand how prefix sum work bro?

bc my teacher said prefix sum will appeared in the exam

so i need help understanding it

[rocky oar]

well there are indeed code examples on that wiki page. did your teacher not teeach it to you at all?

[slow zodiac]

i need to learn python for transfer exam

but my school teaches js

thats the problem

[rocky oar]

so you need to learn python. sounds like you need to start with the basics unless you have some python knowledge already

[slow zodiac]

i got some alrd

but it jst some basics

[rocky oar]

so does it make sense to you that a prefix sum is the cumulative sum of all elements in a list at each index of the list?

list [1, 1, 1, 1, 1] prefix sum [1, 2, 3, 4, 5]

[slow zodiac]

can explain it with code, like just the main part of it

english is not my mother tongue

so im rlly bad

[rocky oar]

well honestly the code to explain it is basically the exact answer to the exam question so lets try a different approach. Are you familiar with for loops?

[slow zodiac]

ye

i think

[rocky oar]

so with the list like [1, 2, 3, 4, 5] how would you itterate over it and print out each number in the list?

[slow zodiac]

for number in numbers:
    print(number)

[knotty knoll]

Hey @slow zodiac!

Please edit your message to use a code block

Add a py after the three backticks.

```py
print('Hello, world!')
```

This will result in the following:

print('Hello, world!')```

[rocky oar]

ok, and you wrote that yourself? cool. so now what would you do if you wanted to add them all together?

[slow zodiac]

i think ima add a loop?

or maybe a sum

[rocky oar]

so you can do it in the same loop
and say you have

x = 1
print(x)```
how would you add 5 to x so that it prints out as `6`?

[slow zodiac]

x = 1
x += 5
print(x)

[knotty knoll]

Hey @slow zodiac!

Please edit your message to use a code block

Make sure there are no spaces between the back ticks and py.

Here is an example of how it should look:
```py
print('Hello, world!')
```

This will result in the following:

print('Hello, world!')```

[rocky oar]

Ok now take that knowledge and apply it to the loop for the list of numbers

[slow zodiac]

i still dont understand can u give me a proper python code for it like an example

[rocky oar]

numlist = [1, 2, 3, 4, 5]
sum = 0
for number in numlist:
    sum += number
print(sum)```

[slow zodiac]

aight tysm

!close

[knotty knoll]

Python help channel closed with !close

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