Reactive Extensions for Python
RxPY is a library for composing asynchronous and event-based programs using observable collections and LINQ-style query operators in Python.
RxPY is open sourced and available under the Apache License, Version 2.0
Questions tagged [rx-py]
96 questions
2
votes
1 answer
Python move from imperative to functional in production
I became infected with functional programming and reactive approach. For inspiration and ideas, I use Haskell and an awesome Rick Hickey article. In the python world I found for myself RxPy and funcy libraries. Now I have thousands of lines of…
fedorshishi
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2
votes
1 answer
RxPy - Turn Live Twitter Stream into Rx Observable?
I followed along this great tutorial to leverage a live Twitter stream in Python using tweepy. This will print Tweets in live time that mention RxJava, RxPy, RxScala, or ReactiveX.
from tweepy.streaming import StreamListener
from tweepy import…
tmn
- 11,121
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2
votes
1 answer
Observing a button press with RxPY
How can I "listen" to stream of key press events with Python?
I want to do something like this:
click_stream.map(lambda k: k.key)
But how can I create this click_stream?
kharandziuk
- 12,020
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2
votes
2 answers
How to use Reactive Extensions (Rx) LINQ in Python?
I downloaded RxPY and was watching the Rx tutorials when I came across:
So how would I get the above working in Python with RxPY? In particular, the query q = from x in xs where... is not syntactically valid Python code -- so how would this be…
mchen
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1
vote
0 answers
RxPY concurrency
I'm trying to understand what operations are serialized and what are not with RxPY. So I printed out thread names and current delay in seconds during map and subscribe calls in the example below.
I was expecting the delay in seconds for map…
Shuming
- 11
- 2
1
vote
1 answer
How to use subprocess in a RxPY map correctly?
I am trying to use RxPY to scan the IP to see which hosts are up.
However, currently it returns empty.
For ping(ip), if I simply return ip, it will return a list of IP address.
from reactivex import operators as ops
import reactivex as rx
import…
Hongbo Miao
- 45,290
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- 174
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1
vote
1 answer
How can I rewrite this countdown timer using RxPY?
Here's RxJS code I'm trying to reproduce with RxPY.
const counter$ = interval(1000);
counter$
.pipe(
mapTo(-1),
scan((accumulator, current) => {
return accumulator + current;
}, 10),
takeWhile(value => value >= 0)
)
…
melkir
- 405
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1
vote
1 answer
Python: How to call async function inside rx.subject subscribe on_next
I need to call an async function inside the on_next of a python rx subscription as this:
from rx.subject import Subject
import asyncio
async def asyncPrint(value: str):
print(f'async print: {value}')
async def main():
s = Subject()
…
Leonardo Rick
- 680
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1
vote
1 answer
Why is it taking so long until rx.interval creates any output?
I wanted to create an observable that emits an event at an interval of 100 ms.
I tried using rx.interval:
import rx
tick = rx.interval(100)
tick.subscribe(on_next=lambda i: print(i))
The process is not running and gives the disposable as…
Aravind OR
- 97
- 2
- 10
1
vote
1 answer
Using combine_latest with more than 2 observables in RxPy
If I have something like this:
scheduler = EventLoopScheduler()
obs1 = rx.range(0, 10)
obs2 = rx.range(20, 30).pipe(ops.combine_latest(obs1))
obs2.subscribe(lambda it: print(it), scheduler=scheduler)
time.sleep(5)
It gives me an output…
Feathers McGraw
- 63
- 6
1
vote
0 answers
how to publish celery state with an observable?
I am building a progress bar application that uses celery for executing async tasks. The task is started with a GraphQL mutation and updates its own state each second:
@celery.task(bind=True, name='mock_analyzing')
def mock_analyzing(self,…
bulle
- 51
- 5
1
vote
1 answer
Can I transpile python 3.7 code to a lower version?
In a python-based project, I would like to use features data classes and libraries such as the current RxPY version.
However, we are bound to an environment (a Yocto-system) that only has Python 3.5.5
From TypeScript/JavaScript I know that some…
David Brem
- 504
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1
vote
2 answers
I am getting "AttributeError: type object 'Observable' has no attribute 'from_'" error in python rx=3.0.1
this is code from the "reactive programming with python" book that I have tried on my laptop.
import sys
from rx import Observable
argv = Observable.from_(sys.argv[1:])
argv.subscribe(
on_next=lambda i: print("on_next: {}".format(i)),
…
Ajay Krishna
- 11
- 2
1
vote
2 answers
type object 'ObservableBase' has no attribute 'create' RxPy
I am trying to understand how RxPy works, I am getting this error
type object 'ObservableBase' has no attribute 'create'
I am using python 3.6 and my code is
from rx import Observable
stocks = [
{'TCKR': 'APPL', 'PRICE': 200},
{'TCKR':…
scionoftech
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1
vote
0 answers
Determine time frame between mousePress and mouseMove for drag event in RxPy
I am trying to achieve a drag and drop feature. The layout of my UI looks similar to below:
--- --- ---
| 1 | 2 | |
--- --- 5 |
| 3 | 4 | |
--- --- ---
Boxes 1, 2, 3 and 4 are images and will have a white border surrounding it when selected…
eugeneoei
- 210
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- 16