aiofile | Real asynchronous file operations with asyncio support | Reactive Programming library
kandi X-RAY | aiofile Summary
kandi X-RAY | aiofile Summary
Real asynchronous file operations with asyncio support.
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Top functions reviewed by kandi - BETA
- Read a line from the stream
- Return the filename of the file
- Decode a given byte string
- Read a unicode object from a file
- Seek to the current position
- Read data from the stream
- Returns the current position of the stream
- Truncate file
- Run a function in a thread
- Read bytes from the file
- Read length bytes from the stream
- Write data to the file
- Write bytes to the file
- Write data to the stream
- Encode the given data
- Get default context
- Create a asyncio context
- Write bytes to file
aiofile Key Features
aiofile Examples and Code Snippets
Community Discussions
Trending Discussions on aiofile
QUESTION
I try to use library cv2 for changing picture. In mode debug I found out that problem in function cv2.namedWindow:
...ANSWER
Answered 2021-Nov-07 at 00:17I reverted back to Xorg from wayland and its working, no more warnings
Here are the steps:
- Disbled Wayland by uncommenting
WaylandEnable=falsein the/etc/gdm3/custom.conf - Add
QT_QPA_PLATFORM=xcbin/etc/environment - Check whether you are on Wayland or Xorg using:
QUESTION
I have a simple python async program that retrieves a gzipped file from a particular URL. I have used the aiohttp for async requests. As per the aiohttp docs (https://docs.aiohttp.org/en/stable/client_quickstart.html), I have used their example under 'Streaming Response Content' in my test method to write the data.
...ANSWER
Answered 2022-Mar-01 at 06:53Good question. Look at the following little program, which runs two tasks. Each has an async context manager and an async iterator:
QUESTION
I'm uploading zip files as UploadFile via FastAPI and want to save them to the filesystem using async aiofiles like so:
...ANSWER
Answered 2022-Feb-09 at 22:07Use as below (source):
QUESTION
I'm using asyncio in concert with the httpx.AsyncClient for the first time and trying to figure out how to complete my list of tasks when some number of them may fail. I'm using a pattern I found in a few places where I populate an asyncio Queue with coroutine functions, and have a set of workers process that queue from inside asyncio.gather. Normally, if the function doing the work raises an exception, you'll see the whole script just fail during that processing, and report the exception along with a RuntimeWarning: coroutine foo was never awaited, indicating that you never finished your list.
I found the return_exceptions option for asyncio.gather, and that has helped, but not completely. my script will still die after I've gotten the exception the same number of times as the total number of workers that I've thrown into my call to gather. The following is a simple script that demonstrates the problem.
ANSWER
Answered 2021-Dec-31 at 23:09The program design you have outlined should work OK, but you must prevent the tasks (instances of your worker function) from crashing. The below listing shows one way to do that.
Your Queue is named "tasks" but the items you place in it aren't tasks - they are coroutines. As it stands, your program has five tasks: one of them is the main function, which is made into a task by asyncio.run(). The other four tasks are instances of worker, which are made into tasks by asyncio.gather.
When worker awaits on a coroutine and that coroutine crashes, the exception is propagated into worker at the await statement. Because the exception isn't handled, worker will crash in turn. To prevent that, do something like this:
QUESTION
I´m developing a simple reactive programming script example to download images from a web, but when I execute the script in VScode I do not get any type of output, I already tried creating a VirtualEnv
In the terminal i get this output:
CODE: ...PS C:\Users\ernes\Desktop\paradigmas> & C:/Users/ernes/AppData/Local/Programs/Python/Python38/python.exe c:/Users/ernes/Desktop/paradigmas/jose.py PS C:\Users\ernes\Desktop\paradigmas>
ANSWER
Answered 2021-Dec-14 at 16:07Add this to the bottom, outside of the class
QUESTION
For asynchronous file saving, I can use aiofiles library.
To use aiofiles library I'd have to do something like that:
ANSWER
Answered 2021-Dec-10 at 18:04Thanks to the comment posted by @MarkSetchell I managed to find the solution.
QUESTION
I have the following method to create a dummy video file:
...ANSWER
Answered 2021-Nov-09 at 23:28It looks like you have to make sure the data is written to the temporary file, before executing FFmpeg.
I don't have any experience with asyncio and aiofiles and I am running Windows 10, so I am not sure about the Linux behavior...
I tried to add await file.flush() after file.write(data), but the FFmpeg execution result was "Permission denied".
I solved it using the solution from the following post:
Add
delete=Falseargument totempfile.NamedTemporaryFile:
QUESTION
Simple Problem statement. I want to read files asynchronously . My problem is when I try to read a file using aiofiles.open it just errors out with the cryptic messsage
...ANSWER
Answered 2021-Nov-06 at 00:13The aiofiles.open context manager is meant to be used asynchronously (async with), in a coroutine. Standard synchronous context managers rely on __enter__ and __exit__ methods, while async context managers use methods named __aenter__ and __aexit__, thus, async with is necessary to call the __aenter__ and __aexit__ methods of aiofiles.open, instead of __enter__ and __exit__ (which are not defined for aiofiles.open):
QUESTION
ANSWER
Answered 2021-Oct-06 at 00:20When you docker run the image, you'll note the following output:
QUESTION
I have a question I'm new to the python async world and I write some code to test the power of asyncio, I create 10 files with random content, named file1.txt, file2.txt, ..., file10.txt
here is my code:
...ANSWER
Answered 2021-Sep-01 at 19:55I post an issue #110 on aiofiles's GitHub and the author of aiofiles answer that:
You're not doing anything wrong. What aiofiles does is delegate the file reading operations to a thread pool. This approach is going to be slower than just reading the file directly. The benefit is that while the file is being read in a different thread, your application can do something else in the main thread.
A true, cross-platform way of reading files asynchronously is not available yet, I'm afraid :)
I hope it be helpful to anybody that has the same problem
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Install aiofile
You can use aiofile like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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