KwickClips Python · 41 sec · free
Why did marks become None?
Short answer. append() returns None, and that None was stored in marks.
Which list method returns the removed item?
pop().
Remember
| append, sort, reverse: None |
| pop: returns the item |
| sorted, len, count: new value |
Storing append gave None. Why? Append changes the list and returns None. Storing that None lost your list. Call append alone. Append, sort and reverse return None. Pop returns the item. Sorted, len and count return values.
This clip is from the full lesson: List Methods and Built-in Functions — 7 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 11 Computer Science (083), CBSE Class 11 Computer Science (083), CBSE Class 11 Computer Science (083), CBSE Class 11 Computer Science Essentials (083)
More KwickClips from this lesson
![Code building a list with list(range(2)), append, extend and insert, printing 6 [9, 0, 1, [5, 6], 7, 8].](/images/learn/clips/PY14-R1.webp)
Why did append give a nested list?45 sec![Code using remove, reverse, count, pop and index on the list [4, 6, 4, 1] with outputs.](/images/learn/clips/PY14-R2.webp)
What is the difference between remove() and pop()?46 sec
Why does print(marks.sort()) show None?40 sec![Code with bill = [40, 20, 60] printing min 20, max 60 and average 40.0.](/images/learn/clips/PY14-R4.webp)
How do you find an average without a loop?41 secVoice-over is AI-generated; the script is written and checked by Kajal Ma'am. Confirm anything you plan around against your official board document. We never ask for a password or an OTP.