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Have you tried using the latest Python Client (version 2.1.0)? It requires only Python 3.7+.

If you still encounter errors, please enable the logger (refer to the Logging section on the Quickstart...

Lightstreamer offers a service similar to Ably, though the terminology for basic concepts differs slightly. Instead of using the term "queue", which is too generic, we refer to subscriptions made by...

I’m sorry, but I don’t understand what you mean by “Queue.”
Could you provide some examples of application software that you would call a “Queue”?

Some libraries are created using Haxe, but the...

Lightstreamer is a comprehensive product that includes a server and a suite of platform-specific clients. The server is a real-time messaging server optimized for streaming data across the Internet...

When integrating the Lightstreamer library into your Python application, it's important to understand its asynchronous nature. The LightstreamerClient.connect() method is non-blocking, which means it...

When a Subscription is configured using an ItemList or a FieldList—either through the setters setItems and setFields or by the constructor—the client verifies that the number of items and fields...

Please attach the log file capturing all events from the initiation to the termination of your application.


Additionally, could you confirm whether the error persists if you switch to...

Which client version are you using?

Can you provide a complete log of the scenario that led to the exception?

For a 7.3.3 server, you need a 1.0.3 client.
See the changelog for further details.

I assure that the example is right.
If you run the command pip list, can you see the library lightstreamer-client-lib 2.1.0?

Could you try running the example provided in the quickstart guide?

It seems there might be a misunderstanding in the way the Lightstreamer Client API is being used.
To ensure the API is used correctly, I recommend reviewing the parameters passed to the class...

Can you explain how to reproduce the error above?
If I run the grid demo in my browser, there is no error.

The Lightstreamer Client SDK does not provide an option to configure a timeout such that if a connection cannot be established within the timeout, then the client is forced to give up.
However you...

Since the Lightstreamer Client API is asynchronous, blocking its threads can have unexpected results.
However you can set a timeout by using a java.util.Timer (or equivalent asynchronous...

What does the method switchToAlternateConnection do exactly?
Does it call a blocking operation such as wait() or similar commands?

Indeed you don’t need to block a thread in order to wait for the...

Hello,

This error is thrown when you pass to ItemUpdate.getValue a field position that is not part of the underlying Subscription.
Pleas keep in mind that field positions starts by 1. Maybe did...

I’m sorry but the image is so blurred that I’m unable to read it.

Which is the message of the exception?
Which method throws it and what are the arguments?

Hello,

When the client is disconnected, all the subscriptions are lost and you don’t have to make any unsubscritiptions. Then, when it gets reconnected, the client issues again all the...

It seems a problem related to aiohttp, a library used by the Lightstreamer Client to make http and websocket connections.
I really don’t know why it happens but you can try the workaround suggested...

Hello,

Please activate the client logger (see the snippet below) and post here the output.

var loggerProvider = new SimpleLoggerProvider();
loggerProvider.addLoggerAppender(new...

Hello,

If you need to pass through a proxy, you have to set it explicitly by using the method ConnectionOptions.setProxy.

For example

client.connectionOptions.setProxy(new Proxy("HTTP",...

I've just released the Python Client SDK 1.0.2 which should fix the issue with Anaconda.
Check it out when you can.

Have you tried to run your script from the Anaconda Prompt?

To open Anaconda Prompt:

- Windows: Click Start, search for Anaconda Prompt, and click to open.
- macOS: Use Cmd+Space to open...

The error is from a third-party library used by the Lightstreamer Python Client, which tries to print some logs to the virtual console of the Spyder IDE. It seems that this console has some...