defining an add function in python

Question

I need help with defining an add function in python. This is my first time writing in python so I have trouble with a lot of the formatting. I need to define an add function for an arraylist that shifts one position all the items j>=i, insert an element at position i of the list and increment the number of elements in the list Inputs: i: Index that is integer non negative and at most n x: Object type, i.e., any object This is what I have written so far:

def add(self, i : int, x : object) :
    if i>0 & i<self.size():

        for n in range(i, self.size())

    else:
        pass

Now I wrote some psuedocode and was wondering if it would work:

def(add(self, i : int, x : object) :
  declare new empty array of size n+1
 if i>0 and i<=n:
   for(i to arr length):
    put i into new array
 else:
  pass

Are you creating your own arraylist class? You can easily achieve this using the insert method or list slices. See [here](https://stackoverflow.com/questions/14895599/insert-an-element-at-a-specific-index-in-a-list-and-return-the-updated-list) — Paul Rooney, Sep 30 '20 at 23:58
You don't need reference to `self` here, this is not a class. And what exactly is `x` used for? — NotAName, Oct 01 '20 at 00:00

score 2 · Accepted Answer · edited Oct 01 '20 at 00:26

2

so, basically python has this built in.

mylist.insert(index, element)

edited Oct 01 '20 at 00:26

ShadowRanger

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answered Sep 30 '20 at 23:58

Clinton Bradfield

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Ironkey · Answer 2 · 2020-10-01T00:23:56.700

1

so much trouble for something already built-in D:

lst.insert(index, element)

edited Oct 01 '20 at 00:23

answered Sep 30 '20 at 23:58

Ironkey

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score 1 · Answer 3 · answered Oct 01 '20 at 00:04

1

def __init__(self, iitems):
    self.items = iitems
    self.size = len(self.items)

def add(self, i, x):
    ret = self.items[:i]
    ret.append(x)
    ret.extend(self.items[i:])
    self.items = ret
    self.size += 1

answered Oct 01 '20 at 00:04

Suspended

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defining an add function in python

3 Answers3