HackerRank Day 15: Linked List problem solution in Python | 30 Days Of Code problems solutions

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[JohnSmith-gvwq]

Hello! Thank you for your solution!
I do have several questions:
1. you put the statement if but never used the statement else. How does it work? Does it automatically assume that if condition doesn't hold, it's else?
2. Do we have to "return head", what if we won't put it? I saw solutions when people used "return head" and solutions when they just assign new node to the head. Which one is better?