Python Thread and Pyqt5
- Thread starter junior04
- Start date
- Jun 6, 2020
- 997
- 310
pyqt has a QThread class that you can use instead of the regular python thread library.
https://realpython.com/python-pyqt-qthread/
https://realpython.com/python-pyqt-qthread/
junior04
Junior Member
- Jan 1, 2021
- 124
- 34
I bought this course
https://www.udemy.com/course/python-programming-inside-out-a-total-reference/
I hope it will be useful to me.
Thank you for your comment. I will search
yellowcat
Regular Member
- Aug 27, 2015
- 404
- 297
simple single-thread example
Multi-threaded sample
Code:
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import ast
import sys
import time
from PySide import QtGui,QtCore
import threading
from PySide.QtCore import QTimer
class SignalHelper(QtCore.QObject):
data_send = QtCore.Signal(object)
class SampleThread(QtCore.QRunnable):
def __init__(self, data):
QtCore.QRunnable.__init__(self)
#Decompress data from string into dictionary
self.mutate = ast.literal_eval(data)
self._signal_helper = SignalHelper()
self.data_send = self._signal_helper.data_send
def run(self):
#Start sample Thread
self.data_send.emit('hello from SampleThread>> Starting !!')
self.logic()
def logic(self):
#Do SampleThread Logic Here
for x in range(0,10):
self.mutate['random_number']+=1
time.sleep(1)
self.data_send.emit(self.mutate)
class Example(QtGui.QWidget):
def __init__(self):
super(Example, self).__init__()
self.initUI()
def starty(self):
data = {'username':'cats',
'msg': 'Hi from Main Gui Thread',
'random_number': 777,
'thread_number':1
}
# we convert the list into a string so the object is not connected in any way then mutate it over with ast
downloader = SampleThread(str(data))
downloader.data_send.connect(self.echo)
self.thread_pool = QtCore.QThreadPool()
self.thread_pool.setMaxThreadCount(1)
self.thread_pool.start(downloader)
self.timer = QTimer()
self.timer.setInterval(10000) #10 seconds
self.timer.start()
self.timer.timeout.connect(self.loop) #call loop every 10 seconds
def loop(self):
#Do Gui updating stuff here such as displaying data
print 'Main Gui Loop every 10 seconds'
thread_count = str(self.thread_pool.activeThreadCount())
self.console.addItem(thread_count)
def initUI(self):
'''Create GUI stuff here
Random notes:
QVBox = Vertical up/down
QHBox = Horizonal left/right
self.resize window height/width
self.console this is our main widget to display data to the gui
'''
self.resize(550, 300)
# QVBox = Vertical up/down
layout = QtGui.QVBoxLayout()
self.console = QtGui.QListWidget()
layout.addWidget(self.console)
self.console.addItem("Very Basic Gui displaying thread usage using python 2.7/Pyside ")
btn = QtGui.QPushButton('Button', self)
btn.clicked.connect(self.starty)
layout.addWidget(btn)
self.setLayout(layout)
def echo(self,payload):
print 'hi from echo'
texty = 'payload -> ' + str(payload)
self.console.addItem(texty)
self.console.scrollToBottom() #scrolls down
def main():
app = QtGui.QApplication(sys.argv)
window = Example()
window.show()
sys.exit(app.exec_())
if __name__ == '__main__':
main()Multi-threaded sample
Code:
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import ast
import sys
import time
from PySide import QtGui,QtCore
import threading
from PySide.QtCore import QTimer
class SignalHelper(QtCore.QObject):
data_send = QtCore.Signal(object)
class SampleThread(QtCore.QRunnable):
def __init__(self, data):
QtCore.QRunnable.__init__(self)
#Decompress data from string into dictionary
self.mutate = ast.literal_eval(data)
self._signal_helper = SignalHelper()
self.data_send = self._signal_helper.data_send
def run(self):
#Start sample Thread
self.data_send.emit('hello from SampleThread>> Starting !!')
self.logic()
def logic(self):
#Do SampleThread Logic Here
for x in range(0,10):
self.mutate['random_number']+=1
time.sleep(x)
self.data_send.emit(self.mutate)
class Example(QtGui.QWidget):
def __init__(self):
super(Example, self).__init__()
self.initUI()
self.THREAD_COUNT = 10
def starty(self):
data = {'username':'cats',
'msg': 'Hi from Main Gui Thread',
'random_number': 777,
'thread_number':1
}
# we convert the list into a string so the object is not connected in any way then mutate it over with ast
self.thread_pool = QtCore.QThreadPool()
for x in range(0,10):
data['thread_number'] = x
downloader = SampleThread(str(data))
downloader.data_send.connect(self.echo)
self.thread_pool.setMaxThreadCount(self.THREAD_COUNT)
self.thread_pool.start(downloader)
self.timer = QTimer()
self.timer.setInterval(10000) #10 seconds
self.timer.start()
self.timer.timeout.connect(self.loop) #call loop every 10 seconds
def loop(self):
#Do Gui updating stuff here such as displaying data
print 'Main Gui Loop every 10 seconds'
thread_count = str(self.thread_pool.activeThreadCount())
self.console.addItem(thread_count)
def initUI(self):
'''Create GUI stuff here
Random notes:
QVBox = Vertical up/down
QHBox = Horizonal left/right
self.resize window height/width
self.console this is our main widget to display data to the gui
'''
self.resize(550, 300)
# QVBox = Vertical up/down
layout = QtGui.QVBoxLayout()
self.console = QtGui.QListWidget()
layout.addWidget(self.console)
self.console.addItem("Very Basic Gui displaying thread usage using python 2.7/Pyside ")
btn = QtGui.QPushButton('Button', self)
btn.clicked.connect(self.starty)
layout.addWidget(btn)
self.setLayout(layout)
def echo(self,payload):
print 'hi from echo'
texty = 'payload -> ' + str(payload)
self.console.addItem(texty)
self.console.scrollToBottom()
def main():
app = QtGui.QApplication(sys.argv)
window = Example()
window.show()
sys.exit(app.exec_())
if __name__ == '__main__':
main()junior04
Junior Member
- Jan 1, 2021
- 124
- 34
thank you so much ❤
yellowcat
Regular Member
- Aug 27, 2015
- 404
- 297
