Note that @26:30 I call the "inorder" traversal function inside of the "postorder" traversal function and neglected to change it to postorder. This was a copy-paste error. You can fix it by changing the "inorder" call in postorder to the appropriate postorder call. Sorry for the mistake, and thanks for watching!
Hi, would be more efficient to add a function from within the class for adding values to the tree? does it help/ would it be more efficient especially during interviews
Thank you for the great tutorial! I am a new developer still looking for a job after graduation from a boot camp. I never had a chance to learn the data-structure, dfs, bfs etc before. Now, it's getting clear to me step by step after watching the videos you posted.
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wow - it is awesome !!! i can tell one analogy that helped me a lot : when do i collect the value : • pre-order - when value collected ?: once I am hovering on a node I am collecting it's value. • in-order - when value collected ?: if the node has no left node or the left node is already visited then add this value. • post-order - when value collected ?: once the node has no left nor right or left and right has been already visited then I will collect the value. HTH
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This is the most simplified video tutorial with good examples, the best I have seen so far. I got everything after watching this video only once. A lot of online tutorials are just too ambiguous and really confusing. Lucid you're the best for sure. Thanks a lot
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Great Video! Thank you for visualising and really emphasizing on the most basic aspects as this is something which I personally as a Beginner seem to struggle with! Keep up the good work it is really appreciated!
Thanks, Chris! That feedback is really helpful for me and I will try to keep that in mind for future videos. Thanks again for watching and for the comment!
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Hi Sarfaraz. Really appreciate that comment, that's very much appreciated! Thank you for watching, and I'm happy to hear this video was effective. Cheers!
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I appreciate the good video and clear explanation. With a little more editing and attention to detail, it can become more polished and will be excellent.
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@@ilanaizelman3993 Thank you, Ilan! Your support is very much appreciated! And yes, I do perform mock interviews, coaching, and consulting services for software-based job preparation. If you're interested in setting something up, you're free to reach out to me in the "About" section of my channel and we can coordinate from there if you like. Cheers, and best of luck in your preparation in any case!
Thank god I looked at the comments regarding the issue with the post order function, I spent a good 10 mins looking to see if I had the wrong implementation
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@@LucidProgramming The preorder_print function is the sort of thing I would have had a hard time coming up with myself. My naïve attempt would have been to have some list or dictionary of nodes whose left child you've already visited ... instead you simply wrote (amongst other things I'm skipping) traversal = self.preorder_print(start.left, traversal) traversal = self.preorder_print(start.right, traversal) This is really interesting, it's orders of magnitude more elegant and succinct. I wouldn't have come up with it. I would have written some longwinded solution using an extra list or dictionary. Do you know a book or online resource that contains Python implementations of many standard data structures ?
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At the moment, those slides are a bit all over the place. However, it would certainly not be an issue to clean them up and post a link in the description of this video. Might take me a while to get around to it, but I'll add it to the list. Thanks for the suggestion and thanks for watching! :)
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Hey Huru. Thank you very much for that comment. It's really great to hear that these videos have been helpful to you. I really get a lot of enjoyment from doing so as well, so the benefit is mutual! Cheers and thanks again for watching.
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Hi there! Thank you so much for this! I just discovered your videos and they are so helpful! I was struggling a lot to understand how I could implement and traverse a binary tree. There are countless videos about this but yours really made me understand and gave me hope that with time and practice I could learn these concepts. I saw you have videos on many data structures and I plan to go through all of them and try to understand. Could you please also cover graph implementation and traversal in Python? Thank you again for your help! Wish you the best!
You can feel free to make suggestions on my Patreon page. This would streamline what you want to see and also help to support my channel. www.patreon.com/lucidprogramming
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great video! i would suggest matching the colors of the slides to the colors of the editor, because the sudden switch from dark to light doesn't sit well while watching. thanks!
Just incase there's someone like me out there: I struggled forever to understand how this code and recursive data structures generally worked until I finally understood recursion. Al Sweigart has a great video on recursion but essentially recursive functions use a stack method to determine how the functions are called. the subsequent functions can't be called until the previous one has been removed from the stack. each number being appended to the string is that function being removed from the stack. So, counterintuitively, the string begins with one because it's the LAST METHOD to be cleared from the stack. All, the other methods cycle through the tree first, appending their value to the string. It sounds backwards, I know. I don't even know if I explained it well but you have to understand recursion to understand BST. Watch Sweigart's video.
@19:30 i don't know if my doubt sounds silly but I want to know how it is moved upward when there is no left or right subtree I didn't get that please can you explain?? and thank you for this amazing video : )
Thank you so much for your explanation it was wonderful. I am having one doubt we haven't coded to go up if we don't have left or right children, then how it goes up programaticaly
Hi Tammay. Thanks for the comment. You might want to check out my recursion playlist if that part is tripping you up. I think it clarifies your confusion. Cheers!
That's right. No difference. According to the link below: in Python 2.7 and older, you need to add the object inside parenthesis. In Python 3 and above, it doesn't make a difference. introtopython.org/classes.html
@@debashishchakraborty7924 Lots of balls up in the air at the moment. Right now, I'm putting together a book that I hope to have video content for. Stay tuned!
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Hi, thank you so much for the video. I am a little confused still about one thing. When in the preorder traversal, when it comes to a leaf that dosn't have a left or right node, in the code how does it go backwards to the previous node or back to the root?
Thanks. I'm not sure how to answer the question. It's kind of like asking "how can I loop over the elements in the tree"? Well, you just use a for loop to do so.
@@LucidProgramming Thanks for the great set of videos. My go to playlists. On this one - a bit confused as to how the recursion is getting back to the right child. In the example, after reaching 4, the left child is none. So the recursive function should not enter the loop at all, so how is reading the right child (5)? I get the code intuitively, but am stuck when trying to create the stack line by line to understand the recursion well.
@@ajrvasu I think what might be insightful is to print out the elements as you make the recursive calls. That might make it a bit clearer as to what is happening. Hope that helps!
Hi Hakan. Sure, the reason for this is because as we hit the base case of the function, we start working back through the stack frame from all the previous recursive calls to the function. I would recommend you print out the output as these calls are being made to see when and where they happen. I think seeing that can be helpful. Hope that makes sense, and thanks for watching!
You can feel free to make suggestions on my Patreon page. This would streamline what you want to see and also help to support my channel. www.patreon.com/lucidprogramming
We are making recursive calls to the function. If this is hard to follow, I would encourage you to check out my recursion playlist here: bit.ly/lp_recursion Cheers!
The height and depth concept..I think the depth at the root node is depth 0 and increases by 1 as you go down the tree. And this is the opposite for the heights. But looks like you started counting at 1 instead of 0.
(17:57) Why in preorder_print (line 4) you passing tree.root? why not self.root? to me it's not clear how Class knows about it's instance? Can you please explain? Thank you
Hi- I think the code for post-order traversal might be incorrect. Is it supposed to output: [4, 5, 2, 6, 7, 3, 1]? Saw a similar tree in this article with this as the output: www.geeksforgeeks.org/iterative-postorder-traversal-using-stack/
Hi Minali. You are absolutely correct. I checked to make sure the other traversals are correct, and they appear to be. As you say though, there seems to be something incorrect about the post-order traversal. I will be updating the code and also adding a note to the video to ensure others are aware of this. Thank you very much for pointing out my error, I sincerely appreciate this as it improves the quality of the content on this channel. Cheers, and thank you again.
Ah actually, I believe my issue here was I was calling the "inorder" function inside of the "postorder" function. Another helpful commenter pointed this out and I have since fixed the code. D'oh! :) Thanks again for letting me know, and thanks for your help!
I think there is a little error in the "print_tree()" function, it shouldn't be "tree.root" it should be "self.root" ! Plus the "postorder" error pointed out in some comments below! Still, it is a great effort. Thanks.
Yep, you are indeed correct. Looks like I too hastily copied and pasted from the previous traversal. I'll make sure to update my code on Github to reflect the correct traversal algorithm. Nice catch, and thanks for watching!
Hello, I looked for traversals on your Github. Couldnt find it. Could you post a link or code correction? Thanks for taking the time to share you knowledge with the masses!
Amazing video. Thank you very much. I just have one question. Is it possible to get a string of the tree using the inorder function but with only using one argument instead of two?
@@ALIENGATORGAMINGYT Yes? I'm still not sure what you're asking. Are the videos on my channel under the data structures playlist all the ones I made? Is that what you're asking? If so, yes.
It is the first time that I come across Instantiate an object of another class without passing it as an argument (Node in BianryTree). Is this a common practise?
Note that @26:30 I call the "inorder" traversal function inside of the "postorder" traversal function and neglected to change it to postorder. This was a copy-paste error. You can fix it by changing the "inorder" call in postorder to the appropriate postorder call. Sorry for the mistake, and thanks for watching!
How can you go from child back to parent if you don't have a next and previous pointer?
By next and previous I should say if each node doesnt have a pointer pointing to the one above it as well as to the one below it?
@@Soccercrazyigboman he is using recursion
That changes the expected output from 4-2-5-6-3-7-1- to 4-5-2-6-7-3-1-
Hi, would be more efficient to add a function from within the class for adding values to the tree? does it help/ would it be more efficient especially during interviews
Thank you for the great tutorial! I am a new developer still looking for a job after graduation from a boot camp. I never had a chance to learn the data-structure, dfs, bfs etc before. Now, it's getting clear to me step by step after watching the videos you posted.
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I was stuck for hours trying to understand this, you made it so simple! Thank you so much
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@@LucidProgramming Done and done my good man!
@@turjo119 Cheers, thank you!
Hands down the best explanation, I've struggled for so long trying to get the intuition through my textbook. Thanks!
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@@LucidProgramming Sure, I've subscribed and signed up for the mailing list. You've made my interviewing process so much smoother.
@@safderaree Awesome, that's really great to hear! :)
wow - it is awesome !!!
i can tell one analogy that helped me a lot : when do i collect the value :
• pre-order - when value collected ?: once I am hovering on a node I am collecting it's value.
• in-order - when value collected ?: if the node has no left node or the left node is already visited then add this value.
• post-order - when value collected ?: once the node has no left nor right or left and right has been already visited then I will collect the value.
HTH
Thanks, and yes that's a great way to remember them!
Your explanation to data structure concepts in python is THE best!
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Extremely thankful to you sir.
Thank you for the kind words, glad the videos are useful for you!
@@LucidProgramming A very welcome sir. Please keep providing. The growth doesn’t justify ur quality. Keep it up sir.
This is the most simplified video tutorial with good examples, the best I have seen so far. I got everything after watching this video only once. A lot of online tutorials are just too ambiguous and really confusing. Lucid you're the best for sure. Thanks a lot
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@@LucidProgramming Sure, I'm interested. But how do I subscribe to your mail list please?
@@muhammadsalisabdulsalam4016 Just follow the link here: bit.ly/lp_email
:)
Your videos deserve more views
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Too excited to sleep now! I finally understand it! Best video on Traversal Algorithms explanation! Consider watching all your python video!
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@@LucidProgramming Just a tiny recommendation, on 17:06, it would be better to use self.root instead of tree .root. Keep going! !!
@@enkaibi2756 Point well taken. Thanks for the comment! :)
Nice introduction! Thanks to support the TI community.
Cheers!
Большое спасибо за ваше видео)
Это потрясающе, я посмотрел ваш Гайд по связным спискам и теперь я тут. Лучшие видео по этой теме!)
Great Video! Thank you for visualising and really emphasizing on the most basic aspects as this is something which I personally as a Beginner seem to struggle with!
Keep up the good work it is really appreciated!
Thanks, Chris! That feedback is really helpful for me and I will try to keep that in mind for future videos. Thanks again for watching and for the comment!
Very informative and easy-to-understand tutorial. Thank you for this incredible contribution to the enthusiasts and learners!
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God bless you Sir. I have been following your tutorials for a while and you are a LEGEND
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i really love the way you are explaining all these concepts in very effective manner thanks for this :)
Hi Sarfaraz. Really appreciate that comment, that's very much appreciated! Thank you for watching, and I'm happy to hear this video was effective. Cheers!
Best video I've seen on this topic. Thank you!
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I appreciate the good video and clear explanation. With a little more editing and attention to detail, it can become more polished and will be excellent.
Thank you! I hope that the videos on this channel keep getting progressively better. Thanks for watching!
@17:04 you type tree.root, shouldn't that be self.root instead?
That's what I thought. It's not clear to me how object will know it's instance
crystal clear
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Beautiful presentation.
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Can't be explained better. Thank you!
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@@LucidProgramming Done! :)
Are you during Mock Interviews?
Or know someone who does?
@@ilanaizelman3993 Thank you, Ilan! Your support is very much appreciated! And yes, I do perform mock interviews, coaching, and consulting services for software-based job preparation. If you're interested in setting something up, you're free to reach out to me in the "About" section of my channel and we can coordinate from there if you like. Cheers, and best of luck in your preparation in any case!
Dude you earned a subscriber and a fan
Thank you, man! Sincerely appreciate the support and love! Cheers!
All Superheroes don't Wear Capes. Some wear Suit too :)
Haha, well I hope the videos are helpful to you. Cheers, and thanks for watching!
What are your vim settings/plugins? I like it
Good question! Much of my configuration is covered here: ruclips.net/video/vlb3qUiS2ZY/видео.html
Thank god I looked at the comments regarding the issue with the post order function, I spent a good 10 mins looking to see if I had the wrong implementation
Glad you caught that, and sorry for the trouble!
Awesome! Just Awesome! This is where I could navigate to learn such an important thing earlier.
Thank you! :)
Great Stuff! Made it very easy to understand! Thanks!
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@@LucidProgramming sure!
@@hussainaqeel7371 Cheers, thank you!
Thanks for such a cool implementation explanation.
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Amazing explanation well worth the time to watch.
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very good video for those who want to pick the grasp of binary tree quickly
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I'm only 3 min in but love the explanations. Thanks!
Great to hear, and thank you for the kind words!
Best Explanation
recursion is bit confusing but following each step through example made it easy... Thanks
Awesome, that's great to hear. Thanks for watching!
I am on Pycharm and I am a beginner. I do not understand what you're doing at 18:15.
I can force-erase the consol but I can't write inside it.
great explanation!!
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phenomenal video, thank you so much!!!
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Great explanations! Thank you very much!!
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Awesome tutorial! Thanks.
Thank you, Philip! I'm glad you found the tutorial useful! Cheers, and thanks again for watching.
Great video. Thank you!
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Amazing explanation, thanks!
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Thank you so much for the great tutorial!!
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good clarification skills, gave it a like
Very much appreciated--thank you for the support!
Dude thank you for this!
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Very valuable explanation! Thanks : )
Glad to hear it, and thanks for watching! :)
@@LucidProgramming The preorder_print function is the sort of thing I would have had a hard time coming up with myself. My naïve attempt would have been to have some list or dictionary of nodes whose left child you've already visited ... instead you simply wrote (amongst other things I'm skipping)
traversal = self.preorder_print(start.left, traversal)
traversal = self.preorder_print(start.right, traversal)
This is really interesting, it's orders of magnitude more elegant and succinct. I wouldn't have come up with it. I would have written some longwinded solution using an extra list or dictionary.
Do you know a book or online resource that contains Python implementations of many standard data structures ?
@@olivierbegassat851 Thanks for the comment. Honestly, you can probably just Google for Python data structures and find something reasonably good.
best explanation on youtube!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Haha, cheers Spamdeep, I really appreciate that :). Happy coding, and thanks for the kind comment!
@@LucidProgramming actually the name is supamdeep not spamdeep
@@ravitanwar9537 Whoops. Must have been my autocorrect? Sorry about that. Thanks for catching, Ravi.
Really good tutorial man! Thanks
Thank you, David, I'm very happy to hear that you enjoyed the tutorial! Cheers.
Thank you! Explained it very well.
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Could you include the link for the presentation as well.It serves as a quick recap.Thanks for the great explanation.
At the moment, those slides are a bit all over the place. However, it would certainly not be an issue to clean them up and post a link in the description of this video. Might take me a while to get around to it, but I'll add it to the list. Thanks for the suggestion and thanks for watching! :)
This is fantastic, thank you
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@@LucidProgramming Already done!
Great work very easy to understand i really appreciate what you are doing to help us
Hey Huru. Thank you very much for that comment. It's really great to hear that these videos have been helpful to you. I really get a lot of enjoyment from doing so as well, so the benefit is mutual! Cheers and thanks again for watching.
Just 30 minutes i go from nothing to understand a lot more about tree could you please make a tutorial about graph and some algorithm about tree ?
Really happy to hear that. Yes, graphs are most certainly coming up soon! Thanks for the suggestion and for the comment!
Thank you soo much for this!
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Thank you for this video
Thank you sir!
You're very welcome. Thank you for watching!
@@LucidProgramming I watched many videos on this subject, yours is spot on!
You're a great teacher, thanks again!
@@ГоранДеспотовић thank you for the kind words!
explains it way better than my ds&a textbook lol
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Legend perfect explanation thank´s I like it.
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Just a small question, is it necessary to make whole class BinaryTree just for the root node? or it has something to do with python versions?
Thank you.
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wish i found your channel earlier. very good
Thanks, TJ. I'm happy you stumbled on it now, and I hope the videos serve you well! Thanks for the comment, and happy coding!
Hi there!
Thank you so much for this! I just discovered your videos and they are so helpful! I was struggling a lot to understand how I could implement and traverse a binary tree. There are countless videos about this but yours really made me understand and gave me hope that with time and practice I could learn these concepts.
I saw you have videos on many data structures and I plan to go through all of them and try to understand. Could you please also cover graph implementation and traversal in Python?
Thank you again for your help!
Wish you the best!
You can feel free to make suggestions on my Patreon page. This would streamline what you want to see and also help to support my channel.
www.patreon.com/lucidprogramming
Thank you very much
Thank you 🙏🙏🙏
Can you explain the recursion in pre-order traversal?
Got a whole playlist on recursion you can check out!
Thanks! Helpful :D
Thank you for watching, and glad to hear that it was helpful!
loved it!
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great video! i would suggest matching the colors of the slides to the colors of the editor, because the sudden switch from dark to light doesn't sit well while watching. thanks!
Thanks for the feedback, that's very helpful to know! Thanks again for watching as well!
no problem dude, i really appreciate your videos!
@@gargoth Cheers, thank you!
Just incase there's someone like me out there: I struggled forever to understand how this code and recursive data structures generally worked until I finally understood recursion. Al Sweigart has a great video on recursion but essentially recursive functions use a stack method to determine how the functions are called. the subsequent functions can't be called until the previous one has been removed from the stack. each number being appended to the string is that function being removed from the stack. So, counterintuitively, the string begins with one because it's the LAST METHOD to be cleared from the stack. All, the other methods cycle through the tree first, appending their value to the string. It sounds backwards, I know. I don't even know if I explained it well but you have to understand recursion to understand BST. Watch Sweigart's video.
Cool, thanks for sharing and thanks for watching!
@19:30 i don't know if my doubt sounds silly but I want to know how it is moved upward when there is no left or right subtree
I didn't get that
please can you explain??
and thank you for this amazing video : )
Thanks, Nivi. I think you might benefit from checking out my recursion playlist as that might clear this up. Hope that helps!
@@LucidProgramming ohh thanks a lot , I'll check that
@@nivi8319 Cheers, let me know if you have questions!
def postorder_print(self, start, traversal):
#Left -> Right -> Root
if start:
traversal = self.postorder_print(start.left, traversal)
traversal = self.postorder_print(start.right, traversal)
traversal += (str(start.value) + "-")
return traversal
Cool, thanks for sharing!
amazing video
This is gold
Thanks, Sam! I'm glad that this video was useful to you. Thanks for the comment and for watching! Cheers.
These are awesome videos I have ever seen. I have a question, why don't you use self.root in print_tree() function, but use tree.root?
Thanks! And either convention is fine there. Using self.root would work just as well. Cheers!
@@LucidProgramming Thank you a lot, these videos would definitely help me in my future career interview! I will recommend it to other friends.
@@jingfenghong2312 Thank you, I sincerely appreciate that!
Thank you so much for your explanation it was wonderful. I am having one doubt we haven't coded to go up if we don't have left or right children, then how it goes up programaticaly
Hi Tammay. Thanks for the comment. You might want to check out my recursion playlist if that part is tripping you up. I think it clarifies your confusion. Cheers!
@@LucidProgramming Ok Thank you so much sir. I will go through that playlist first.
@@hackytech7494 Cheers!
Thanks Sir, what is difference b/w class Node(object): and class Node:
No difference at all!
That's right. No difference. According to the link below: in Python 2.7 and older, you need to add the object inside parenthesis. In Python 3 and above, it doesn't make a difference.
introtopython.org/classes.html
@@amithpandit4043 kk tq :)
Please make videos on bfs and dfs and some of its important use , in python it is hard to find on utube
It's on my list of videos to make! Subscribe and stay tuned!
@@LucidProgramming ..you are not making new videos, no one can explain python data structures better than you. please do something....
@@debashishchakraborty7924 Lots of balls up in the air at the moment. Right now, I'm putting together a book that I hope to have video content for. Stay tuned!
@@LucidProgramming Thanks for the tutorial... please make such videos in python about data structures and you explain it like a pro please continue..
@@vnaveenkumar982
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Hi, thank you so much for the video. I am a little confused still about one thing. When in the preorder traversal, when it comes to a leaf that dosn't have a left or right node, in the code how does it go backwards to the previous node or back to the root?
I would encourage you to check out my playlist on recursion, as it seems you have a gap in understanding how recursive calls are treated.
Hi..Thank you so much for uploading video with nice explanation..
Cheers! If you found the video helpful, I would definitely appreciate any a like/subscribe/share! Thanks for watching!
what does tree.root.left represent?
Hello, great video. What if I wanted to create a nested list that represented the tree?
Thanks. I'm not sure how to answer the question. It's kind of like asking "how can I loop over the elements in the tree"? Well, you just use a for loop to do so.
Sir in each order_print functions how node gets back to head position when its left child or right child becomes None.
Through the recursive call of the function (if I understand the question correctly).
@@LucidProgramming Thanks for the great set of videos. My go to playlists.
On this one - a bit confused as to how the recursion is getting back to the right child. In the example, after reaching 4, the left child is none. So the recursive function should not enter the loop at all, so how is reading the right child (5)? I get the code intuitively, but am stuck when trying to create the stack line by line to understand the recursion well.
@@ajrvasu I think what might be insightful is to print out the elements as you make the recursive calls. That might make it a bit clearer as to what is happening. Hope that helps!
@@LucidProgramming Thanks for the suggestion.
@@ajrvasu No problem, cheers!
can you explain @19:33 when you call return tranversal, why it returns you the previous node of the current node that has empty left and right childs?
Hi Hakan. Sure, the reason for this is because as we hit the base case of the function, we start working back through the stack frame from all the previous recursive calls to the function. I would recommend you print out the output as these calls are being made to see when and where they happen. I think seeing that can be helpful. Hope that makes sense, and thanks for watching!
Please make videos on graph and please add more questions on trees 😭😭
You can feel free to make suggestions on my Patreon page. This would streamline what you want to see and also help to support my channel.
www.patreon.com/lucidprogramming
Just wanted to know how does it know to go back ie., (Upwards) (19:12)
We are making recursive calls to the function. If this is hard to follow, I would encourage you to check out my recursion playlist here:
bit.ly/lp_recursion
Cheers!
Hi Vincent, excellent as usual. is it possible to traverse iteratively as well? you got some code for us to see?
Of course, anything you can do recursively you can generally do iteratively. I don't have code for it, but I encourage you to try.
The height and depth concept..I think the depth at the root node is depth 0 and increases by 1 as you go down the tree. And this is the opposite for the heights. But looks like you started counting at 1 instead of 0.
Thnq sir I am facing a TypeError: Binary tree takes no argument .
Tell me about this
You might want to check your code against my GitHub code.
If I'm not mistaken, depth of root node is 0. Root node is at level 0, not 1 :)
(17:57) Why in preorder_print (line 4) you passing tree.root? why not self.root? to me it's not clear how Class knows about it's instance?
Can you please explain?
Thank you
Can u pls make playlists of graph theory and heaps?
It's on my list of things to get to. Thanks for the suggestion!
@@LucidProgramming and one more thing can u make a video on binary tree inserting the elements in level order by an array.
@@prathamgupta7605 You can make these suggestions on my Patreon page!
@@LucidProgramming pls share your patreon page link
@@prathamgupta7605 That would probably help: www.patreon.com/lucidprogramming
Hi- I think the code for post-order traversal might be incorrect.
Is it supposed to output: [4, 5, 2, 6, 7, 3, 1]? Saw a similar tree in this article with this as the output: www.geeksforgeeks.org/iterative-postorder-traversal-using-stack/
Hi Minali. You are absolutely correct. I checked to make sure the other traversals are correct, and they appear to be. As you say though, there seems to be something incorrect about the post-order traversal. I will be updating the code and also adding a note to the video to ensure others are aware of this. Thank you very much for pointing out my error, I sincerely appreciate this as it improves the quality of the content on this channel. Cheers, and thank you again.
No problem! Thanks for fixing it!
Ah actually, I believe my issue here was I was calling the "inorder" function inside of the "postorder" function. Another helpful commenter pointed this out and I have since fixed the code. D'oh! :) Thanks again for letting me know, and thanks for your help!
Perfect
I think there is a little error in the "print_tree()" function, it shouldn't be "tree.root" it should be "self.root" ! Plus the "postorder" error pointed out in some comments below!
Still, it is a great effort. Thanks.
Indeed, thank you for the comment!
For the output on 19:38 I received an output "Traversal type preorder is not supported." Is that the correct output? Am I missing something?
You should check your code against mine on GitHub.
Sir from where you draw trees in PPT.
Can you suggest any app
Shapes? If you can draw a circle and draw line, you can draw a tree.
In the postorder_print function, I think you are calling the inorder_print function for the left and right nodes erroneously (copy/paste error).
Yep, you are indeed correct. Looks like I too hastily copied and pasted from the previous traversal. I'll make sure to update my code on Github to reflect the correct traversal algorithm. Nice catch, and thanks for watching!
Not a problem. Thank you for posting. All of this is pretty helpful and makes things more clear for the rest of us.
Any time Ahmer, happy to hear that these videos are helpful to others. Cheers and have a nice day!
Hello, I looked for traversals on your Github. Couldnt find it. Could you post a link or code correction? Thanks for taking the time to share you knowledge with the masses!
Amazing video. Thank you very much. I just have one question. Is it possible to get a string of the tree using the inorder function but with only using one argument instead of two?
Sure, you should be able to do that.
sir i want to ask that is it the complete tutorial for data structure in python
I don't understand your question.
Sir i meant to say that is this course complete all about data structure or some topics remaining...?
@@ALIENGATORGAMINGYT Yes? I'm still not sure what you're asking. Are the videos on my channel under the data structures playlist all the ones I made? Is that what you're asking? If so, yes.
Yes sir the videos on data structure playlist...is it the complete course...
@@ALIENGATORGAMINGYT I still have more I want to add, so I'm not sure it will ever be "complete" :)
What is the "object" argument you pass when creating class?
It's legacy Python. You can do either class Name: or class Name(object):
when i saw vim, i trusted you :)
Haha, cheers!
tq ^_^
Hope that's a positive comment for the video. Cheers, and thanks for watching!
It is the first time that I come across Instantiate an object of another class without passing it as an argument (Node in BianryTree). Is this a common practise?