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Top functions reviewed by kandi - BETA
- Set the data at index
- Pushes elements to this node
- Creates a new node instance .
- Remove a node from the graph .
- Enqueue a given item .
- Returns a string of the suffix .
- Add a child
- Deletes a graph with the given identifier .
- Add an edge
- Returns true if the current edge is adjacent to the given object
datastructures Key Features
datastructures Examples and Code Snippets
Community Discussions
Trending Discussions on datastructures
QUESTION
Hi I'm coding review page with Flask but struggling with creating delete button. According to my code, when delete button is clicked, KeyError appears. There are only two rows in the review table which are Writer and Content. I pasted showing and deleting review API code, also with Server side Delete function.
Is my way alright to delete code by sending title and review from client to server then delete the object in DB which matches title and review which is sent by client? I'm wondering why KeyError is appeared. I beg for your help! Thanks for reading.
...ANSWER
Answered 2021-Jun-10 at 03:01The issue stems from your string interpolation when generating the button.
${title, review}
only injects the value of review
. Since your deleteReview
only receives one argument, the review_give
field in the data of ajax call is left blank, leading to the corresponding missing key in your flask app.
This is how you correctly do your string interpolation:
QUESTION
Is there any way in Python to invert a list or a tuple in just one expression, without doing, for example:
...ANSWER
Answered 2021-Apr-10 at 13:44list_ = range(10)
list_ = [-x for x in list_]
QUESTION
I tried going through many similar questions regarding munmap_chunk(): invalid pointer
errors, but I'm stuck as to what to do. I tried adding free
commands too.
I'm a C++ novice and normally use Python and Java, so the whole concept of pointers and memory management are new to me. It would be great if someone can explain what I'm doing wrong.
Here is my code for my Array class for a generic T:
...ANSWER
Answered 2021-Jun-03 at 07:39Thanks to @S.M. @anastaciu and @jkb for their guidance.
The original code posted here was:
QUESTION
He there, I have have been trying to find a solution to my problem for 2 days now but still have not found anything. Might just be missing it. My flask web app is run on Microsoft azure. The error is very simple discretionary not found but i don't know how to find out what the right path is.
I get the following error:
...ANSWER
Answered 2021-May-24 at 18:56upload folder is defined as app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
, but does seems like it exist, so the line of code f.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
is getting failed. you can try
- create the folder "uploads", and it will be at the same level as templates.
- the os.remove will look like as below(remove the first /)
QUESTION
I am trying to fetch data from a form in Flask the form has a file as well:
app.py
...ANSWER
Answered 2021-May-11 at 10:49In your return statement, you are using "{{}}", just remove those and it will work fine. It should be like this
QUESTION
I have a Parent ViewModel which contains a child view model object inside with some enum,
When I open the UI I see that the enum value not renders as expected from the RaisePropertyChanged event on first time loading, however, after setting a value from the UI the value changes and renders as expected.
Parent VM xaml
...ANSWER
Answered 2021-May-06 at 19:07ProjectTypes
is a List
and ProjectType
is a ProjectType
.
The types should match so either change the type of the source collection:
QUESTION
First things first, I'm new to Python and the following info may contain bad coding and incorrect names.
I have the following Endpoint example to create a key using an HTTPS API:
...ANSWER
Answered 2021-May-02 at 01:37I think the part you're missing is how to parameterize the name
key. I'll break it down:
QUESTION
I'm currently learning C and also some datastructures such as binary search trees etc. I have trouble understanding HOW exactly changing pointer values within a function works in some cases and in others doesn't... I'll attach some of my code I wrote. It's an insert function which inserts values in the correct places in the BST (it works as it should). I tried working with pointers to pointers to be able to change values withing a function. Even though it works, im still really confused why it actually does. I don't quite understand why my insert function actually changes the BST even though I only work with local variables (tmp, parent_ptr) in my insert function and I don't really dereference any pointers apart from " tmp = *p2r " in the insert function.
Thanks for helping out.
...ANSWER
Answered 2021-May-01 at 09:17While the pointers themselves are indeed local variables, they point to a specific location in memory. When you dereference the pointer by using the -> symbol, you're basically accessing the memory where that exact variable to which the pointer is pointing to is stored. This is why your changes are reflected outside the function as well.
You basically told a local variable where your tree is stored, it helped with the insertion, and then it went out of scope. The tree itself is not a local variable so the changes are reflected on it.
I suggest reading up on how pointers work.
QUESTION
I try to use list-comprehensions see link here: https://docs.python.org/3/tutorial/datastructures.html#list-comprehensions
but it create generator instead of return list
And when I try to convert it to list- it work only once, and then the list disappear
...ANSWER
Answered 2021-Apr-27 at 11:56(str(x) for x in values)
is not a list comprehension, it's a generator expression.
[str(x) for x in values]
, on the other hand, is a list comprehension.
The first expression makes a one-time generator that gets exhausted the moment you iterate through it. The second expression places the result of that iteration into a list, so you can access the elements again.
QUESTION
I am trying to develop a UI for a machine learning model that i implemented with the extratees classifier.
Below code shows how i exported the model after training to use in the UI. The prediction is done using the is_attributed
column.
ANSWER
Answered 2021-Apr-24 at 15:49You have a few misunderstandings here.
Firstly, as from code, you can see that model is trained on 7 columns as inputs [ip, app, device, os, channel, hour, day]
. And the model is trained to predict values from is_attributed
column. So feed a model list with 7 values -> receive 1 value as output. And this value seems to be 0 or 1 depends on input 7 values.
Secondly, we can proceed now to the Flask part. Basically, what you do here is that you load dataframe and select one column (attribute = df['is_attributed']
). IF you have dataframe with 50000 rows and you select one column it means that you select 50000 values! And then you tried to send this to model, which wants exactly 7 values as inputs.
As from my perspective, it looks like that you want to run model on each row on test
dataframe.
To do that you need:
- load
test
dataframe; - check that you have only 7 columns (
[ip, app, device, os, channel, hour, day]
) in dataframe. If you have more columns, remove all other; - go through each row in dataframe (each from total of 50000);
- run model using 7 values from row as inputs;
- model's output append to a python list;
- after 50000 runs you will have python list with 50000 values;
- return this list.
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