while Conditional loop
Last updated: 2026-09-22
while Conditional loop
while repeats the body while the condition is true.
| Category | Keywords & Statements |
|---|---|
| Kind | Keyword / Statement |
| Python Version | all |
📝 Syntax
while condition:
block
[else:
block]▶ Example
Edit the code, press Run, and see the result in the output panel:
Output：
3
2
1🏷️ Related Keywords / Statements
💡 Related Cases
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❓ FAQ
QMy `while` loop never stops. What should I do?
AUsually the loop body never changes the condition variable, or the condition is always true (e.g. `while True` with no `break`). Check that the condition variable is updated, or add a `break` inside the loop.
QWhat is `while True` typically paired with?
AIt is often paired with `break` to implement «process first, check later» loops, e.g. `while True: line = input(); if line == 'q': break`. Be sure there is an exit condition, or it becomes an infinite loop.
QWhen is the `while` condition checked?
ABefore each iteration of the loop body. If the condition is false at the start, the body never runs even once.
