youtu | Tencent Youtu Open Platform third-party SDK
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QUESTION
I have a list (dput() below) that has 4 datasets.I also have a variable called 'u' with 4 characters. I have made a video here which explains what I want and a spreadsheet is here.
The spreadsheet is not exactly how my data looks like but i am using it just as an example. My original list has 4 datasets but the spreadsheet has 3 datasets.
Essentially i have some characters(A,B,C,D) and i want to find the proportions of times each character occurs in each column of 3 groups of datasets.(Check video, its hard to explain by typing it out)
...ANSWER
Answered 2021-Jun-09 at 19:00We can loop over the list
'l' with lapply
, then get the table
for each of the columns by looping over the columns with sapply
after converting the column to factor
with levels
specified as 'u', get the proportions
, t
ranspose, convert to data.frame
(as.data.frame
), split by row (asplit
- MARGIN = 1), then use transpose
from purrr
to change the structure so that each column from all the list
elements will be blocked as a single unit, bind them with bind_rows
QUESTION
In this video, he shows how multithreading runs on physical(Intel or AMD) processor cores.
and
All these links basically say:
Python threads cannot take advantage of many physical cores. This is due to an internal implementation detail called the GIL (global interpreter lock) and if we want to utilize multiple physical cores of the CPU
we must use true parallel multiprocessing
module
But when I ran this below code on my laptop
...ANSWER
Answered 2021-Jun-15 at 08:06https://docs.python.org/3/library/math.html
The math module consists mostly of thin wrappers around the platform C math library functions.
While python itself can only execute a single instruction at a time, a low level c function that is called by python does not have this limitation.
So it's not python that is using multiple cores but your system's well optimized math library that is wrapped by python's math module.
That basically answers both your questions.
Regarding the usefulness of multiprocessing
: It is still useful for those cases, where you're trying to parallelize pure python code or code that does not call libraries that already use multiple cores.
However, it comes with inter process communication (IPC) overhead that may or may not be larger than the performance gain that you get from using multiple cores. Tuning IPC is therefore often crucial for multiprocessing in python.
QUESTION
I had to reinstall my MacBook. I downloaded python from brew.
When I copy and paste code in the python shell from brew, the text is highlighted and the code not executed.
When I use the stock python from my MacBook there is no problem.
Please check this short video: https://youtu.be/CrTzBpVdcVM
I'm not the only one with this problem, however no solutions had been found yet:
SyntaxError when pasting multiple lines in Python
https://python-forum.io/Thread-How-to-paste-several-lines-of-codes-to-the-Python-console
...ANSWER
Answered 2021-Jun-14 at 13:53It seems that there is a bug in readline (which is used by Homebrew to install Python)
Short answer:
QUESTION
I can not choose a date in iOS, is there any known problem with RadDataForm DatePicker?
Check it out it has some strange kind of opening. User can not understand where to click or how to turn back again.
- iPhone 8 simulator with iOS 14.3
- nativescript-ui-dataform: 7.0.4
- IPHONEOS_DEPLOYMENT_TARGET = 13
It can display the date but I cannot change the date.
- Click on datepicker
- Jumps to bottom of the page below
- Scroll back to up
- Click on an empty area
When I click on the empty area I can see the calendar.
NOTE: I don't have problems with other Pickers, Stepper, or Switches. Just DatePicker does not work.
...ANSWER
Answered 2021-Feb-03 at 17:10The iOS 14 date and time pickers implementations work not good at least for now. As a solution, I use the old "inline/wheel" style of date/time picker. You can do it this way:
QUESTION
I’m trying to setup the emulator so I can develop the firebase functions safely before deploying them. I just noticed that some REST calls I’m doing now fails - anybody know if it is not possible to use the REST feature of the RealTime DB https://firebase.google.com/docs/reference/rest/database
I'm trying to hit it with this URL
http://localhost:9000/?ns=-default-rtdb/development/DISHES.json
because this is what I set the firebaseConfig.databaseURL
to (suggested here by Google)
Bonus info: If I try to do a GET to the URL via postman it creates another database called fake-server
(http://localhost:4000/database/fake-server: null
) 🤔
ANSWER
Answered 2021-Jun-12 at 11:45According to RFC 3986, the path must come before the query parameters in URLs. Your URL should be instead written as:
QUESTION
After watching the Microsoft video on this page, I decided that I should start testing for server-side pagination by looking for @odata.nextLink fields in all my Graph API (v1.0) query responses, particularly on SharePoint resources. In the video at about 1:38s, one of the presenters says that the nextLink is "typically" placed next to the collection in the response.
So far, this is what I have encountered when I analyze the json response of the queries: the collection field is placed immediately after the @odata.nextLink field in the json object. In the example below, the collection field, 'value' immediately follows the field, '@odata.nextLink'.
However, I am a little concerned about the presenters choice of words ("typically"). Can I expect this to always be the case though with Graph API?
I would like to know if I can build my query algorithm such that whenever I encounter a nextLink, I look to the next field to be the collection that I'll perform concatenation on when visiting the nextLink fields, or if there are cases that will break the algorithm.
Thank you.
...ANSWER
Answered 2021-Jun-09 at 20:54You should never assume a fixed order in any serialized response. In the case of OData, a nextLink
will always be a top-level property but it can appear above or below the collection being returned:
All annotations or control information for a structural or navigation property MUST appear as a group immediately before the property itself. The one exception is the
nextlink
of a collection which MAY appear after the collection it annotates.
It's also worth noting that while other annotations always appear before the collection, the spec does not specify the order of those annotations (with some exceptions such as id
and etag
).
When working with JSON, properties are best retrieved by name (typically by deserializing the response).
QUESTION
I'm having a problem trying to use the pytube
package to download a video from YouTube.
I'm getting a "HTTP Error 404: Not Found"
error. Is anyone familiar with this error? I've been trying to research about this but yet to find anything that causes the problem.
I will share my code and the error below:
...ANSWER
Answered 2021-May-27 at 13:39This was a known bug with pytube
.
After installing a new version of pytube (released on 21 may 2021), pip install pytube==10.8.2
or python -m pip install --upgrade pytube
it got fixed.
QUESTION
I have a question: I have a ListView.builder in Flutter with Songs and every Song item has a Play Button on the left. So I click the play button the Icon changes and the song gets played. When I click another song in the list how can I set the Icon to stop from the previous song? Like in this Video:
So just setting the icon/bool of the previous icon to false and the new one to true.
...ANSWER
Answered 2021-Jun-05 at 14:27I believe this is what you are looking for.
You should create a state variable, in this case _index
. This value holds the index of the item that is currently being played. In the builder
method of the ListView
widget you can check if it's index is the same as the state's index.
QUESTION
Android Studio can't start the debugger if I use C code though JNI. Running it normally works well, but the debugger doesn't even start, regardless if I'm debugging Kotlin or C code.
It throws a message Debugger process finished with exit code 127. Rerun 'app'
And the only detail it gave me is com.intellij.execution.ExecutionFinishedException: Execution finished
.
Here I set up a simple github repository to replicate the error: https://github.com/perojas3/Android-JNI-debug-bug-example. It simply calls C code to get a string and then displays it in a toast.
And here I set up an small youtube video displaying the bug the way it is happening: https://youtu.be/8jIL5yqP7m8
I'm using Manjaro Linux right now.
...ANSWER
Answered 2021-May-16 at 10:02I also had this issue. I was able to run and debug my code normally, but for some reason I started to get this crash while running on debugging mode:
Debugger process finished with exit code 127
After playing a lot with Android Studio's settings and Edit Configurations, clearing caches, restarting both Android Studio and the computer and many other things, nothing was helpful.
I struggled with it a lot and the fact that there're no discussions anywhere about it annoyed me a lot, so having no information online together with the previous feeling about it happening after upgrading to Android Studio 4.2, made me think maybe it's a new issue raised in Android Studio's new 4.2 version.
So, I decided to download Android Studio 4.1.3 and give it a try. It worked like a magic and I can finally debug my code :)
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:
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