KwickClips Python · 39 sec · free
What is underflow?
Short answer. Popping or peeking when the stack is empty.
When does overflow happen in Python?
Only when you set a size limit, since a list grows by itself.
Two stack errors
| Error | When | Check |
|---|---|---|
| Underflow | pop when empty | len == 0 |
| Overflow | push when full | len == SIZE |
Remember
| Check before you pop |
| Check before you push |
What happens when you pop an empty stack? Underflow, and Python gives IndexError. Underflow is popping when empty. Overflow is pushing when a fixed size stack is full. Remember two things. Check before you pop. Check before you push.
This clip is from the full lesson: Stack Implementation Using a List — 6 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 12 Computer Science (083)
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