working solution

[avcode3]

No description provided.

[super30admin]

• The solution is correct and efficient.
• The initial check for head being null is acceptable, but note that without it the code would still work (if head is None, the while loop condition fails and returns prev which is None). So you can simplify by removing the initial check.
• In Python, it's idiomatic to write while head: instead of while(head): (parentheses are not necessary for conditionals).
• The variable names are clear and the code is well-structured.