QtConcurrent in PySide/PyQt
pyqt update gui from thread
pyqt event loop
qrunnable vs qthread
pyqt ui is hanging thread runs
I'm trying to figure out if subclassing QtConcurrent and writing a run method inside it will work:
class Task(QtCore.QtConcurrent): def run(self, function): function()
Or is it completely useless?
It's completely useless, because QtConcurrent is a namespace, not a class.
Also, neither PyQt nor PySide provide any of the functionality provided by
QtConcurrent, because it's all template-based and therefore impossible to wrap.
PS: the PySide documentation you linked to is for the ReduceOption enum. Since it's doubtful whether that enum has any use outside the
QtConcurrent namespace, it's probably a bug that PySide includes it.
QtConcurrent — PySide v1.0.7 documentation, The QtConcurrent namespace provides high-level APIs that make it possible to write multi-threaded programs without using low-level threading See the Qt Concurrent chapter in the threading documentation. Indt Openbossa Qt Python. It's completely useless, because QtConcurrentis a namespace, not a class. Also, neither PyQt nor PySide provide any of the functionality provided by QtConcurrent, because it's all template-based and therefore impossible to wrap. PS: the PySide documentation you linked to is for the ReduceOptionenum.
The class you are looking for is QRunnable.
Multithreading PyQt applications with QThreadPool (Updated 2020 , thanks for your great explanation ,it helped me a lot !!! the GIL is not present under Ironpython nor Jython and so, running multithreaded Python� The QtConcurrent namespace provides high-level APIs that make it possible to write multi-threaded programs without using low-level threading primitives. See the Qt Concurrent chapter in the threading documentation.
I am stuck on the same problem in PyQt5. I guess the only solution is to do this locally:
def connect(self): class ConnectThread(QThread): def __init__(self, func): super().__init__() self.func = func def run(self): self.func() self.connectThread = ConnectThread(self._connect) self.connectThread.start() def _connect(self): if self._driver is None: uri = self.uriString() if uri and self.user and self.password: self.statusMessage.emit("Connecting to the Graph Database....", -1, "color:blue;") try: self._driver = GraphDatabase.driver(uri, auth=(self.user, self.password)) self.statusMessage.emit("Connected!", 5000, "color:green;") except Exception as e: self.clearStatusMessage.emit() Error(str(e)).exec_() if __debug__: raise e
And remember to set the thread to a member variable:
self.thread = ... or else your thread reference will go out of scope, and most likely the thread object deleted.
You could also move your function-to-call into a local definition of it as Python allows both nested functions and classes within one another!
[PySide] QtConcurrent support? - Mailing Lists, if he is right(QThread is "real" multithreading in Python),then why > not add QtConcurrent to PyQt ? Because its API is very difficult, if not� PySide (deprecated), PySide2 (Active) is basically the same as PyQt, but with a different license and developed by the QT company, to makes things even less clear it also goes by the name QT for
[PyQt] QtConcurrent support?, This function is a part of the Qt Concurrent framework. Running a Function in a Separate Thread�. To run a function in another thread, use QtConcurrent::run� Detailed Description¶. All other Qt modules rely on this module. To include the definitions of the module’s classes, use the following directive:
Concurrent Run — Qt for Python, Software dev with almost 10 years of work experience, love python, django, smart home, automations, IoT stuff. Currently working full time on� Detailed Description¶. All other Qt modules rely on this module. To include the definitions of the module’s classes, use the following directive:
PyQt: Threading Basics Tutorial, Internally the QtConcurrent module uses the QThreadPool class for Oct 28, 2015 � Python Quick Tip: Simple ThreadPool Parallelism Published Oct 28, 2015 � The event loop is started by calling.exec_ () on your QApplication object and runs within the same thread as your Python code. The thread which runs this event loop — commonly referred to as the GUI thread — also handles all window communication with the host operating system.
- Why won't you give it a try?
- Very interesting. I was just about to experiment a little bit with
QtConcurrentin PyQt5 when I realized that I can't find anything. Thanks for the hint. I guess C++ it is. :D
- That does not provide the ability to call any function I don't think... Only option here is to inherit from QThread. See my solution above.