🔒 list problem

[arctic sinew]

@empty sail

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[empty sail]

homework assignment for python module in engineering course

[leaden kiln]

so, have you learnt about list.pop?

[empty sail]

i googled it just now

i understand that it will remove the last element

the code to check last element in list tho

[leaden kiln]

yes, for that you would go about doing negative indexing

[graceful owl]

items[-1] refers to the last element in items

[empty sail]

if list(last variable) == 0:

ah ok

so if list[-1] == 0:

list.pop(-1)

[leaden kiln]

essentially:

        [1,  2,   3,   4,   5]
index:   0   1    2    3    4
rev_index:-5  -4  -3   -2   -1

[empty sail]

ahh yea

coming back to me

[leaden kiln]

so now

[empty sail]

so basically -1 is always the "last" because its counted from the right so its always the first

ok

[leaden kiln]

you can use your knowledge of looping and think of the conditions you need to check

[leaden kiln]

yep, its always last

[empty sail]

while list[-1]==0:

list.pop(-1)

would that work coz ik while is shit

[leaden kiln]

there is one more condition, you are forgetting that the list should not be trimmed beyond the last element

[empty sail]

oh yea

uhh

while list[-1] == 0 and len(list)>1:

[leaden kiln]

perfect :)

you've done it!

[empty sail]

;-; thanks

[solid mirage]

litearlly 2 lines of code

should get 100 on this

[empty sail]

nah that snot the whole assignment

💀

[solid mirage]

best of luck

[leaden kiln]

oof, good luck

[empty sail]

ill send it if ur curious

[solid mirage]

let it be a mystery

[empty sail]

nvm u cant upload files

gg

part a from Q1 when it goes to like abcdefghi lmao

its not too bad

[solid mirage]

ooh you're building to spec

[empty sail]

but im shit at python

[solid mirage]

just use a language you're comfortable then

[empty sail]

idk any other language

they kinda just expect us to learn python alongside engineering which is valid but i always struggled with coding one day ill b good tho

[leaden kiln]

its alright, they should've have included python in lectures

[solid mirage]

savages
well you'll be alright, you have this discord to ask questions to.

[empty sail]

if someone wants to hop on vc for a sec i got a question about how to implement this into the code i got

coz we get a unit tests file that is specific

about waht it wants

[leaden kiln]

its alr, you can post it here, this is ur thread

[solid mirage]

im not familiar with python's unit tests

but with docs available it won't be too bad

[empty sail]

while list[-1] == 0 and len(list)>1:

TypeError: 'type' object is not subscriptable

gimme a sec tho might just be like

[leaden kiln]

where is your list defined?

[empty sail]

not calling the correct variable

in the unit tests file there is

[solid mirage]

paste your entire code

[leaden kiln]

yes, you need to replace list in the above for ur variables

[solid mirage]

!paste

[arctic sinew]

Pasting large amounts of code

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[empty sail]

my codfe

first pic was unit tests

ok nvm i did it i think

[leaden kiln]

noop

you need to replace list with self.List

imagine, list is a type of object

[leaden kiln]

yep

[empty sail]

yea

[leaden kiln]

but

you need to do self.List.pop

[empty sail]

ah okay

[leaden kiln]

because List is part of yourself

[empty sail]

can u explain self

the definition for it

sucks

i just know to use it

[leaden kiln]

it is essentially, uh

well, think of self as an "instance" of an object

[empty sail]

ah yea

[leaden kiln]

class is the blueprint

the object that you 3d print is an instance of that blueprint

[empty sail]

right okay

yea making sense

well im stuck on the next part if ur not doing anything lol

its the coefficients and degrees

[empty sail]

referring to above pics

last 3 bullet points there

[leaden kiln]

a moment, lemme see

[empty sail]

and the unit tests i sent are the inputs

[leaden kiln]

essentially, the List that you are storing is a list of cofficients for an equasion

[empty sail]

Yes

[leaden kiln]

instead of storing it into List

store it into self.cofficients

(sadly, you will have to rename a lot of stuff)

[empty sail]

hmm okay what do u mean

[leaden kiln]

instead of self.List = List, you'd have to do self.cofficients = List and then replace everything that used List with cofficients

[empty sail]

uhh

line 3 on your pic you mean?

[leaden kiln]

yep

and everything that says self.List changes to self.cofficient

essentially

[empty sail]

i see

[leaden kiln]

you are renaming a property/attribute

[empty sail]

okay let me give it a try

so everything >line 3

not the class itself

[leaden kiln]

yep

[empty sail]

well yea thats self, List... 🤦‍♂️

anyway

okay so what about my line of code down there, useless basically

[leaden kiln]

yep, pretty much, you can safely discard it

[empty sail]

ignore the # there for now ig is not relevant too

nice okay so how do i assign degrees

[leaden kiln]

uh well

how is degrees defined?

i mean

do you go asscending

or descending?

because the order of cofficients should match the order of degrees

right?

how is the equation defined?

[empty sail]

umm

hold on a sec

uhh

can u hop into vc ill screenshare?

u dont need a mic

its just kinda easier for me to explain and show u what i can see

[leaden kiln]

you essentially can't screenshare in this server without a helper/mod being present in vc

its alr, just send screenshots

!paste
or use this

[arctic sinew]

Pasting large amounts of code

If your code is too long to fit in a codeblock in Discord, you can paste your code here:
https://paste.pythondiscord.com/

After pasting your code, save it by clicking the Paste! button in the bottom left, or by pressing CTRL + S. After doing that, you will be navigated to the new paste's page. Copy the URL and post it here so others can see it.

[empty sail]

i can add u as a friend

[leaden kiln]

sorry, its a personal policy, i don't take dm or fr

[empty sail]

oh yea no worriers

[leaden kiln]

right

as you can see

the degrees of the polynomial is stored ascendingly

so your degrees of polynomials are essentially [0, 1, 2, 3, ..., n]

[empty sail]

right i see

so based on the length of the list

[leaden kiln]

yep

you create an empty list and add numbers to it in ascending order until its filled with correct length

[empty sail]

soo becuase its like

1x^1 + 2x^2 + 3x^3 etc

or whatever coefficients

[leaden kiln]

yep

but

remember

[leaden kiln]

that polynomials start with 1x^0 instead of 1x^1

[empty sail]

ah yea

[leaden kiln]

the constant term is x^0

noop

not that way

you need to create an empty list

and then add items to it :)

using append

[empty sail]

self.degree = ()

ah

okay

[leaden kiln]

lists are made using [] square brackets instead

[empty sail]

so like self.degree = [] and then

self.degree.append(self.coefficients)

-1 ?

or idk

[leaden kiln]

no no

you need to loop, i'll write some examples for you to better understand it, 1 moment

[empty sail]

alright thanks

[leaden kiln]

when you define a list

my_list = []

you can append items to it one by one

my_list.append(5)
my_list.append(3)
print(my_list)

[5, 3]

so you can use the range function, which essentially is a counter

range(4) = [0, 1, 2, 3]

remember, range will never include the last item but will always start from 0

so when you combine this

my_list = []

for item in range(5):
    my_list.append(item)
print(my_list)

[0, 1, 2, 3, 4]

now, use the above knowledge and substitute 5 with whatever number of cofficients you have to make the degrees

[empty sail]

uhh

the number of coefficients is variable

[leaden kiln]

yep, that is len() of your self.cofficients

[empty sail]

ah ok

[leaden kiln]

len function returns the length of ur list

[empty sail]

so ok

self.coefficients is my list

[leaden kiln]

but

you need to create a new list

the list where you are appending degrees

[empty sail]

self.degrees = []

[leaden kiln]

so self.degrees = [] is the list you are modifying

yep

[empty sail]

yea

for i in range(len(self.coefficient)):

[leaden kiln]

yepppp

[empty sail]

self.degrees.append(i)

uhh

[leaden kiln]

perfect ✨

[empty sail]

hot

seems to not work

am i forgetting that its - 1

or something

@leaden kiln

@leaden kiln pliz help

[misty sand]

@empty sail Okay, so if you give me a minute, I can read through this thread, or you can give me a quick summary on what you currently need help with.

[empty sail]

yeah i can try

basically

ok so i am making the degree part

ill show u code

these are the unit tests we get for our code

[misty sand]

This appears to be graded work.

[empty sail]

ok the self.degree.pop[0] is basically a random guess to see if it works i need the degree list to like

work

[empty sail]

yea

[misty sand]

Okay, in which case, the assistance I'm able to provide may be limited, which, given the subject matter, may not be at all noticeable in terms of difference.

[empty sail]

okay

well what can u help me with basiccally i need the list of degrees to match the polynomial

[misty sand]

So you're aware, asserts generally should only ever be included in unit testing code, not your code code. There's an option to turn off asserts in Python, which means if you're even relying on them for your program logic, someone could turn those off and someone's day.

[empty sail]

well we have to include assertions in our own code too

so im thinking its basically the length of the list of coefficients minus 1

[misty sand]

So long as you understand that may be considered as undesirable beyond this course.

[empty sail]

yes i understand that

[misty sand]

Is this a comparison testing operation you're wanting to make?

[empty sail]

this is how the coefficients should be defined

im just trying how to figure out how to extrapolate self.degrees

from self.coefficients

as you can see they define it in the tests

[misty sand]

What is a degree?

[empty sail]

its just - 1

[misty sand]

I understand degrees as in 360 degrees, but...

Or as in ouch, that is rather hot, isn't it?

[empty sail]

;-;

[misty sand]

Or the third degree.

[empty sail]

Degree of a polynomial ?

[misty sand]

Yes.

[empty sail]

that...

[misty sand]

I'm not mathy.

[empty sail]

ok anyway

so bascially i can see this

so from this u can kinda decipher that the degree is the polynomial with the front 0's removed minus 1

[misty sand]

I'm just looking at that for loop in your polynomial class.

It doesn't appear to be especially useful.

[empty sail]

its also not relevant to what im asking i understand your concern but

it is useful

the inputs are not limited to what i have shown, you can get non float/intergr inputs

[misty sand]

So I'm seeing this. https://en.wikipedia.org/wiki/Degree_of_a_polynomial

I'm sorry, I don't know how to assist you with this without an education in the subject matter.

[empty sail]

yea its okay man

i figured it out

[misty sand]

Good.

[empty sail]

in future say that at first haha the first guy that helped me was a genius ;-;

this isnt everyones cup of tea its engineering mathmatics python

[misty sand]

I did say I wasn't mathy.

[empty sail]

not fun

[misty sand]

You also said this was a list problem.

[empty sail]

it is

this is the line of code that solved it

lmao

[misty sand]

Seriously? That's all?

[empty sail]

no maths involved really just reverse engineered the unit tests

yesman

u probs overcomplicated it

although i dont blame u

i have been stressing this the last 3021312321 horus

[arctic sinew]

Python help channel closed

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🔒 list problem