list.append() — Python Technical Interview Questions & Answers

list.append()

list.append()

  • list.append() works on a list. Lists can change. Many methods update the same list (append, pop, sort, insert) instead of returning a new one.
  • list.append() — output: ['Asha', 'Ravi']. append adds at the end.
  • Trap for list.append(): append([1, 2]) nests a list. extend([1, 2]) adds 1 and 2. sort vs sorted is a viva favourite.
  index →  0       1       2
  list  → [Asha,  Ravi,  Neha]

Technical Interview Tip: In place or new list? Say it first, then one example.

Code Examples for list.append()

Example

# list.append()
a = ["Asha"]
a.append("Ravi")
print(a)

list.append() — output: ['Asha', 'Ravi']. append adds at the end.

How to Explain list.append() to an Interviewer

Explain list.append() as if you are teaching a junior — definition, then one tiny script.

list.append() changes or reads a list. list.append() — many list methods are in place.

What does the example print, and why?

list

What mistake do freshers make with list.append()?

list.append() — sort vs sorted, in place vs new list.