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Each time the while begins, I expects all and only the nodes of a single level to be in this_level.
for_inrange(len(this_level)):
This line allows me to iterates only on the nodes in a single level, as their amount is the initial length.
If _ confuses you, it's just a convention symbol that states you don't need and won't use the corresponding variable, in this case the loop index.
node,score=this_level.pop(0)
The pop function removes the first element of the list. I remove the first since I am going to extend the list with the next level.
As the element I am going to pop is a tuple, I can assign both variable on a single line, thanks to Python sintax.
Extend is more suitable (and faster) when you need to "append" more than one thing at a time (any iterable).
Since I need to add two items (left and right), it is preferable.
N.B.: I could also have used a simple "+=" (which is infinitesimally faster), but this is more explicit and I prefer it for such things.
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Trying to decipher some of your logic (thanks for the comments, they're a huge help).
what is happening in this line?
Thanks
Each time the while begins, I expects all and only the nodes of a single level to be in this_level.
This line allows me to iterates only on the nodes in a single level, as their amount is the initial length. If _ confuses you, it's just a convention symbol that states you don't need and won't use the corresponding variable, in this case the loop index.
The pop function removes the first element of the list. I remove the first since I am going to extend the list with the next level. As the element I am going to pop is a tuple, I can assign both variable on a single line, thanks to Python sintax.
Feel free to keep asking! :)
okay, i finally understand it.
Thank you so much!
wait no, sorry, one last thing.
why use extend instead of append?
I used a similar solution with the level order traversal one but used append instead.
Extend is more suitable (and faster) when you need to "append" more than one thing at a time (any iterable). Since I need to add two items (left and right), it is preferable.
N.B.: I could also have used a simple "+=" (which is infinitesimally faster), but this is more explicit and I prefer it for such things.