How to make this code work?

Question

https://sololearn.com/compiler-playground/cQfKH3oguuj7/?ref=app
Sample usage #1:

>>> l = LinkedList([2, 7, 4, 9, 18, 19, 22])
>>> l.to_list()
[2, 7, 4, 9, 18, 19, 22]
>>> l.len()
7
>>> l.get(3)
9
>>> l.has(17)
False
>>> o = LinkedList([7])
>>> o.to_list()
[7]
>>> o.len()
1
>>> e = LinkedList([])
>>> e.to_list()
[]
>>> e.len()
0
Sample usage #2:

>>> l = LinkedList([2, 7, 6, 4])
>>> l.delete(2)
>>> l.delete(5)
>>> l.delete(4)
>>> l.to_list()
[7, 6]
>>> l.delete(6)
>>> l.delete(7)
>>> l.to_list()
[]
>>> l.delete(8)
>>> l.to_list()
[]
Sample usage #3:

>>> l = LinkedList([2, 7, 4])
>>> l.rotate()
>>> l.to_list()
[4, 2, 7]
>>> o = LinkedList([8])
>>> o.rotate()
>>> o.to_list()
[8]
>>> e = LinkedList([])
>>> e.rotate()
>>> e.to_list()
[]
Sample usage #4:

>>> l = LinkedList([2, 7, 4, 9, 18, 19, 22])
>>> m = LinkedList([2, 7, 4])
>>> n = LinkedList([9, 18, 19])
>>> e = LinkedList([])
>>> l.starts_with(m)
True
>>> m.starts_with(l)
False
>>> l.starts_with(e)
True
>>> l.contains(n)
True
>>> m.contains(l)
False

Answer 1

init is a dunder method.

def __init__(self, ...):

not
def init(self,...):

Answer 2

Bob_Li ,

I mentioned init vs __init__ in his last thread. Maybe he didn't see it.

I get the impression that his teacher avoids dunders, because most of the other required methods should really be implemented as some combination of dunders too, but __init__ is unavoidable.

Answer 3

safir safir1 ,

Thanks for providing the playground link, but why did you start a new thread?

https://www.sololearn.com/Discuss/3265678/?ref=app

Answer 4

safir safir1 ,

What about the usage examples in this opening message? Are those from a session with your teacher's completed solution (since yours doesn't work yet)?

.rotate() and .startswith() were not described in the requirements in your previous thread.

Sololearn doesn't have an interactive Python Read, Evaluate, Print, Loop (REPL) terminal mode. You'll have to write the usage into your code as executable statements and run it normally.

You can use this Python idiom to make the file both runnable and importable:

# Your classes go here.
class Node:
pass

class LinkedList:
pass

def main():
# Your test usage stuff goes here.
pass

if __name__ == "__main__":
# Only call main() if this module (file)
# is run, not if it is imported.
main()

Answer 5

Thanks Rain, I am fixing code

Answer 6

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