aiter | Useful constructs building upon asynchronous iterators | Reactive Programming library
kandi X-RAY | aiter Summary
kandi X-RAY | aiter Summary
[PEP 525] describes asynchronous iterators, a merging of iterators with async functionality. Python 3.6 makes legal constructs such as. which is a huge improvement over using async.Queue objects which have no built-in way to determine "end-of-stream" conditions. This module implements some patterns useful for python asynchronous iterators. Documentation available on [readthedocs.io] A [tutorial] TUTORIAL.org) is available. [github version] CAVEAT This project is still in its infancy, and I reserve the right to rename things and cause other breaking changes.
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Top functions reviewed by kandi - BETA
- Map a function over aiterable
- Joins an asynchronous iterable
- Simple map function
- Convert an iterable
- Creates a task that pulls an asynchronous iterable
- Push items to the queue
- Stop the cursor
- Convert an event stream into an event stream
- Multiprocessing map function
- Convert a message stream to an event stream
- Returns True if there is no item available
- Checks if there is at least n items in the queue
- Return an iterator that returns the available resources
- Start an asyncio asyncio server
- Create an asyncio push server
- Join an iterable
- Yield lines from a stream
- Start an asyncio server
aiter Key Features
aiter Examples and Code Snippets
Community Discussions
Trending Discussions on aiter
QUESTION
In python 3.10 we see newly built-in-function aiter(async_iterable). In python docs. the definition is "To Return an asynchronous iterator for an asynchronous iterable." But I can't understand how to use or no definition with example in google/ youtube. Does anyone know how to use this built-in function?
...ANSWER
Answered 2021-Dec-24 at 08:08aiter() and anext() call an object's __aiter__() and __anext__(), if present. They're essentially the async equivalent of iter() and next(). In most cases, you'll want to simply use an async for, instead. However, to understand what aiter() and anext() are doing, the coroutines using_async_for() and using_aiter_anext() in the following example are roughly equivalent:
QUESTION
ANSWER
Answered 2021-Nov-16 at 08:30Like with the regular synchronous iter and next builtins, you rarely need to use the new builtins directly. The async for loop in main calls the __aiter__ and __anext__ methods of your class already. If that does all you want, you're home free.
You only need to explicitly use aiter and anext if you are writing code that interacts with an asynchronous iterator in some way not directly supported by a async for loop. For instance, here's an asynchronous generator that yields pairs of values from the iterable it's given:
QUESTION
I want a function that takes two arguments, both of which can be turned into an iterator of Foo. The snag is that I'd like to accept things which are both IntoIterator and also IntoIterator<&Foo>. Importantly Foo is Copy so I can cheaply create an owned copy from it's reference.
The solution I currently have is:
...ANSWER
Answered 2021-Jun-15 at 12:22First of all, you don't need exactly IntoIterator bound here. It's just enough for Iterator.
QUESTION
I can’t find out how to use otThreadGetChildNextIp6Address. I am using two devices, one is the leader and the other is a child. I need the leader to get child addresses, is it possible to do it with this API?
I have tried with arguments below but it returned OT_ERROR_NOT_FOUND.
aChildIndex: I have set it to0. I am quite sure the issue does not come from the index as I usedotThreadGetChildInfoByIndexabove with0index and it works fine.aIterator: I have created aotChildIp6AddressIteratorvariable and I have passed its address to the API.aAddress: I have created aotIp6Addressvariable and I have passed its address to the API.
Have I missed something?
...ANSWER
Answered 2021-Apr-15 at 23:59See the OpenThread CLI implementation for an example of using otThreadGetChildNextIp6Address().
QUESTION
Trying write a simple API to access a Db2 database table with packed decimal fields. Without converting the value, is there a corresponding data type in C#? I keep getting a mismatching data type error.
{"Specified cast is not valid."}
Data: {System.Collections.ListDictionaryInternal}
HResult: -2147467262
HelpLink: null
InnerException: null
Message: "Specified cast is not valid."
Source: "IBM.Data.DB2.Core"
StackTrace: " at IBM.Data.DB2.Core.DB2DataWrapper.get_Int32Value()\r\n at IBM.Data.DB2.Core.DB2DataReader.GetInt32(Int32 i)\r\n at Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable1.AsyncEnumerator.d__17.MoveNext()\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Runtime.CompilerServices.ValueTaskAwaiter1.GetResult()\r\n at Microsoft.EntityFrameworkCore.Query.ShapedQueryCompilingExpressionVisitor.d__221.MoveNext()\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at Microsoft.EntityFrameworkCore.Query.ShapedQueryCompilingExpressionVisitor.d__221.MoveNext()\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAw
aiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter1.GetResult()\r\n at CoreCodeCamp.Data.TestRepository.d__6.MoveNext() in TestRepository.cs:line 60\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter1.GetResult()\r\n at CoreCodeCamp.Controllers.TestController.d__4.MoveNext() in TestController.cs:line 38"
TargetSite: {Int32 get_Int32Value()}
Here is the code...
DB2 Camps table:
...ANSWER
Answered 2020-Sep-22 at 20:34You should show your code...
But the IBM i .NET data provider should have a iDB2Decimal structure used for packed numeric.
iDB2Decimal.Value returns a C# Decimal type.
EDIT
ok, so you have both packed decimal CAMPID P 5,0
and zoned decimal LENGTH S 3,0
which should correspond to iDB2Decimal and iDB2Numeric.
Both of which have a Value property that returns a C# Decimal.
So I'd recommend changing your model from int to Decimal to those two fields.
Location is also packed in the DB, I'm not sure what you've done with your Location type...
LOCATIONID P 5,0
public Location Location { get; set; }
QUESTION
I am trying to build an async generator, but I couldn't find any resources or figure out how to do it.
I am still getting the same error
TypeError: 'async for' requires an object with aiter method, got coroutine
I read a not understandable for pep from 2016 and I am really confused.
Basically what I am trying to do is to schedule multiple coroutines and when one of them finishes I yield a value so I can process it immediately after the result comes without waiting for every result.
But I couldn't figure out this so I decided I will assume that coroutines will finish in the order they were created and I still have a lot of problems
I am looking for some solution for either yielding coroutines result in one after another or reacting to the first finished coroutine
Thanks in advance for any tips, resources, examples, and solutions :)
...ANSWER
Answered 2020-Sep-15 at 21:25To create an async generator, you create an async def with a yield inside, much like your code does. In fact, your code looks like something that should actually work, although imperfectly, so I don't know why you're getting the error you quote.
However, there are issues with your code:
- it will always yield the coroutines in the order they are given, not in the order in which they complete - but they will run in parallel.
- you don't need both
ensure_future()andcreate_task(),create_task()is sufficient - you don't
asyncio.gather()to await a single thing, it's for when you have more than one thing to await in parallel
To get a generator that yields awaitables as they complete, you can use asyncio.wait(return_when=FIRST_COMPLETED), like this:
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Install aiter
You can use aiter 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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