在python中定义一个add函数

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 nx: Object type, ie, 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

Answer 1

所以，基本上python内置了这个。

mylist.insert(index, element)

Answer 2

对于已经内置的 D:

lst.insert(index, element)

Answer 3

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