Python array program not giving correct output

Question

I am using below code for adding an element in array but it is giving me below error while running it

cars = ["Ford", "Volvo", "BMW"] 
cars.append("Honda") 
cars[4] = "BMWq";
for x in cars:
  print(x) 

Output error

List assignment index out of range

Not able to understand reason of this error

As the error says, the index is out of range. `cars` doesn't have an element at index 4. You need to push to it, you can't just assign to arbitrary indices. — Carcigenicate, Jan 13 '19 at 17:01
What are you expecting to get? Which version of Python are you using? — Shedokan, Jan 13 '19 at 17:02
You can't assign to a non-existent list index; you need to use `list.append` to add a new element. — snakecharmerb, Jan 13 '19 at 17:02
@Carcigenicate why it works fine when i do cars[3] = "BMWq"; then what is the issue with cars[4] As i am appending an item just above it — Passionate Coder, Jan 13 '19 at 17:03
@user1234 Because `cars` has an element at index 3 that can be overwritten. There isn't an element at index 4 though to overwrite. — Carcigenicate, Jan 13 '19 at 17:04

score 2 · Accepted Answer · answered Jan 13 '19 at 17:03

2

You can't extend a Python list by assigning values to an element that doesn't exist. This

cars.append("Honda")

is the correct way to assign a new element 3. To assign element 4 that does not yet exist, call cars.append() again.

answered Jan 13 '19 at 17:03

BoarGules

1 Answers1