hacky | Low level CPython tinkering utils | Cron Utils library
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Low level CPython tinkering utils.
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QUESTION
So I have this dash app where I want to display a png image based on the user's input. It works, but the problem is every time the user makes a selection the image is shown on top of the previous image. I want to somehow clear the previous image so it only shows the most recently selected image.
In app.layout
I have:
ANSWER
Answered 2021-Jun-14 at 23:36To update existing image you should use html.Img(...)
instead of html.Div(..., children=[])
in app.layout
, and update component_property='src'
instead of component_property='children'
Many tools can save image/file in file-like
object created in memory with io.BytesIO()
Example for matplotlib
QUESTION
I'm running the code below as part of a Celery task.
...ANSWER
Answered 2021-Jun-13 at 09:16I would add the celery
user to the sudoers
file with the only command allowed being the one needed. Use visudo
and add these lines
QUESTION
I'm using an API that returns § characters with a color code (1-9 or a-h) which I want to eliminate (§ and following character). Their purpose is for color formatting but I'm not using that and my method iterates through a string to remove them but could not find a better way and it fees too hacky and buggy. Is there like a parameter for the str.replace
function that removes the letter after the found character?
ANSWER
Answered 2021-Jun-12 at 02:35You can "eliminate" the precise pattern with regular expressions
using the sub
method:
QUESTION
My goal is to get the HttpStatus from a Spring WebClient request. All other information of the request is irrelevant.
My old way of doing this was:
...ANSWER
Answered 2021-Jun-11 at 21:54This problem can be solved with the method exchangeToMono
. This results into the following snippet.
QUESTION
I am currently trying to implement a TextField that should change the background Color-based on the state of the Text Field (unfocused, focused, error).
I have tried to implement this by using a List that manages only whether the TextField is selected or not. I use a GestureDetector to set that value. But this seems way too hacky to be a good solution, especially because tapping on the TextField isn't the only way to focus it.
At this point, I was hoping that there is a way to get the same information the TextField Widget uses to display the appropriate border style. But I am not sure if it is possible to access this information. A tip on how to do so would be highly appreciated.
I was also thinking that I could use the FocusScope for this, but I could not find a way to call .hasFocus on a single TextFormField, because it only shows me whether one TextFormField in the whole Form is selected and not which one.
Thank you!
...ANSWER
Answered 2021-Jun-11 at 16:14You can either use FocusNode
or Focus
inside a FocusScope
to achieve something like this. TextField
itself uses a FocusNode
to determine if it has focus or not and then animates the color changes when the focus state changes. Here is an example implementation using Focus
and a Builder
to rebuild only the TextFields
which changed focus:
https://dartpad.dev/8488f470b166e4235b64d3ba568b6ba6?null_safety=true
QUESTION
I've been playing around with metaclasses to try and get a good feel of them. A really simple (and pointless) one I came up with is the following:
...ANSWER
Answered 2021-Jun-10 at 12:16I realize this may create more trouble than it solves, but if you don't plan to derive anything from MappingMeta, this seems to get around the problem (in that your code above runs).
QUESTION
I'm using React + NextJS, and I'm trying to render a list of products, much like you'd see on a typical ecommerce category page. Each product is in a p
, and that p
should link to the appropriate detail page (so it should be surrounded by an anchor a
tag).
Unfortunately, the links work but they don't render actual anchor tags. Can anyone explain what I'm missing?
Scenario A: a normal text link (works as expected)
input:
...
ANSWER
Answered 2021-Jun-09 at 20:48According to https://github.com/vercel/next.js/blob/canary/packages/next/client/link.tsx the a
tag is added automatically if the child is a string. Otherwise it just returns the child. So in your case the child is a p
tag, so that's all that is returned. Seems like you could just wrap that in an a
tag and that should work.
QUESTION
Just installed pop_OS 20.10. My laptop is connected to a second monitor, I usually have both monitors display the same image.
Every time I boot it changes my display settings to "Join Displays" and then overlaps the two display (I don't know why overlapping the displays is even possible.
I change the display settings to something reasonable but they change back after a restart.
Is there any proper fix for this, or a hacky fix such as changing display settings in a shell script and adding the shell script to startup? (I couldn't find how to change settings through a shell script)
...ANSWER
Answered 2021-Jun-08 at 20:06You will want to disable the HiDPI Daemon which is in the Settings -> Display.
QUESTION
I have a class as follows:
...ANSWER
Answered 2021-Jun-08 at 16:58You can use a superclass and the __init_subclass__
hook to wire things up:
QUESTION
I use echo framework for creation of my API server. It is started by systemd and needs root by default, in order to aquire ports below 1024. For security I like to downgrade privileges of my go program after the listening port has been aquired by echo framework.
I know how to downgrade, but I can not find a suitable event/callback for this? The problem is, that echo.Start()
and echo.StartAutoTLS()
do not come back. I can create a parallel thread and try to find some status value of my echo session telling me that the port was opened, but I can not find such status indication either.
How can I make sure that I get some code executed after the port is aquired (and know for sure)?
Until now I run a parallel go thread just before server creation and wait 5 seconds to do the downgrade then. It works so far, but this is hacky and I don't like it :-(
...ANSWER
Answered 2021-Jun-07 at 14:52You can use e.ListenerAddr() to check if the port is open. It will return nil until the port is open.
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