Developer FAQs | Developer Questions And Answers

Jupyter notebook: No connection to server because websocket connection fails

I have just installed Jupyter over pip (Python version is 3.7.2) in Windows 10, started the jupyter server by calling jupyter notebook, created a new notebook with kernel python3 in my web browser but a connection to the kernel is never achieved.

03月03日发表评论

Groupby and append lists and strings

I am trying to group-by the values in my "value_1" column. But my last column is made up of lists. When I try to group-by using my "value_1" column, the column made up of lists disappears.

03月03日发表评论

Nested ambiguously typed methods

Say I have a classWith ambiguous types enabled, I could specify each of them in an instance:If I want to make tag2 append something to tag1, I can define

03月03日发表评论

How to sum objects properties inside objects?

I am trying to sum the total of matches and participants of each cup in this object:I don't know how to sum properties when the object has another object inside it (sorry I didn't learned that yet);

03月03日发表评论

Checking if an array is 'right' (C++)

A right arrayLet's assume we have an array with an N length, made of capital letters A, B, and C. We call the array 'a right array' if between every two C letters which come one after another in the array, there are more A letters than B letters. My...

03月03日发表评论

Why can a 352GB NumPy ndarray be used on an 8GB memory macOS computer?

When I run the above code on my 8GB memory MacBook with macOS, no error occurs. But running the same code on a 16GB memory PC with Windows 10, or a 12GB memory Ubuntu laptop, or even on a 128GB memory Linux supercomputer, the Python interpreter will raise a MemoryError....

03月02日发表评论

Facing error (0 , (_wordwrap || _load_wordwrap(…)).default)(…)(…).trimStart is not a function on expo init

I am trying to create react native application with Expo. As per react native official documentation, I have installed Node 8+ (v8.12.0) & expo-cli on my windows system and then run command expo init AwesomeProject. But its giving error as

03月02日发表评论

Applicative functor evaluation is not clear to me

I am currently reading Learn You a Haskell for Great Good! and am stumbling on the explanation for the evaluation of a certain code block. I've read the explanations several times and am starting to doubt if even the author understands what this piece of code is doing.

03月02日发表评论

Implicit conversion and operator overload

So, I wrote something like thisAnd it printedI'm a bit confused:Is this well-defined behaviour, or is it implementation specific?

03月02日发表评论

name character vectors with same name of list

I have a list that looks like this. I want to name each list element (the character vectors) with the name of the list they are in. All element of the same vector must have the same name

03月02日发表评论