Python While Loops - Repeat Code with Conditions
Build your first Python `while` loop by controlling a simple status dashboard countdown. You'll see how repeated actions, Boolean conditions, changing state, and stopping conditions work together so code repeats only while a condition stays true.
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⏱ Chapters:
0:00 Intro — Arohas Code Lab
0:03 Repeated Dashboard Checks Need One Rule
0:12 While Checks Before Every Repeat
0:22 Countdown State Starts the Loop
0:31 Changing State Moves Toward Stop
0:41 Missing Updates Create Infinite Loops
0:52 State Condition Change Checklist
Challenge
Complete this function:
```python
def count_down(start):
pass
```
Expected behavior:
`count_down(3)` returns `[3, 2, 1]`
`count_down(1)` returns `[1]`
The countdown stops before `0`
Worked Solution
```python
def count_down(start):
numbers = [] # Store each positive countdown number.
seconds_left = start # Track the changing dashboard state.
while seconds_left ＞ 0: # Repeat while the countdown is still positive.
numbers.append(seconds_left) # Save the current countdown value.
seconds_left = seconds_left - 1 # Move one step closer to stopping.
return numbers # Return the completed countdown list.
print(count_down(3)) # [3, 2, 1]
print(count_down(1)) # [1]
```
The key is that `seconds_left` is both checked by the condition and changed inside the loop. That state change is what prevents an infinite loop.
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