Loops in Python — Python Technical Interview Questions & Answers

Loops in Python

Loops in Python

  • A loop repeats a block until you stop it. for walks each item in a list, string, or range. while repeats while a condition stays true. Pick for when you know the items. Pick while when you wait until something becomes false — like “until the user types quit”.
  • break leaves the loop. continue skips the rest of this round. pass does nothing. while True without a break or an update never ends — the terminal just sits there. That infinite-loop trap is worth one sentence in the viva.
  • Loops in Python — output: for 1 2 3 then while 3 2 1.

Technical Interview Tip: Define loop, then for vs while in one line each.

Code Examples for Loops in Python

Example

# Loops
for i in range(1, 4):
    print("for", i)
n = 3
while n > 0:
    print("while", n)
    n -= 1

Loops in Python — output: for 1 2 3 then while 3 2 1.

How to Explain Loops in Python to an Interviewer

Explain Loops as if you are teaching a junior — definition, then one tiny script.

Repeat a block. for = items. while = condition.

What does the example print, and why?

Loops in Python — output: for 1 2 3 then while 3 2 1

What mistake do freshers make with Loops?

Infinite while True.