我要评论多线程异步线程是我们常用的，如我们在执行耗时操作，又不想卡用主程序 ；
1. qthread
from pyqt5.qtcore import qthread, pyqtsignal
from pyqt5.qtwidgets import qapplication, qlabel, qvboxlayout, qwidget, qpushbutton
import time
class workerthread(qthread):
progress = pyqtsignal(int) # 定义信号
def __init__(self,main_instance):
qthread.__init__(self)
self.main_instance = main_instance
def run(self):
for i in range(1, 101):
self.main_instance.excutesomething()
self.progress.emit(i) # 发送信号
class mainwindow(qwidget):
def __init__(self):
super().__init__()
self.resize(800, 600)
self.initui()
def initui(self):
self.label = qlabel("进度: 0")
self.button = qpushbutton("开始任务")
self.button.clicked.connect(self.start_task)
layout = qvboxlayout()
layout.addwidget(self.label)
layout.addwidget(self.button)
self.setlayout(layout)
def excutesomething(self):
time.sleep(0.1) # 模拟耗时操作
def start_task(self):
self.worker = workerthread(self)
self.worker.progress.connect(self.update_label) # 连接信号到槽函数
self.worker.start() # 启动线程
def update_label(self, value):
self.label.settext(f"进度: {value}")
app = qapplication([])
window = mainwindow()
window.show()
app.exec_()子线程中回调主线程函数执行，在子线程；
2. qthreadpool
from pyqt5.qtcore import qrunnable, qthreadpool, pyqtsignal, qobject
from pyqt5.qtwidgets import qapplication, qlabel, qvboxlayout, qwidget, qpushbutton
import time
class workersignals(qobject):
progress = pyqtsignal(int)
class worker(qrunnable):
def __init__(self):
super().__init__()
self.signals = workersignals()
def run(self):
for i in range(1, 101):
time.sleep(0.01) # 模拟耗时操作
self.signals.progress.emit(i) # 发送信号
class mainwindow(qwidget):
def __init__(self):
super().__init__()
self.resize(800, 600)
self.initui()
self.thread_pool = qthreadpool()
def initui(self):
self.label = qlabel("进度: 0")
self.button = qpushbutton("开始任务")
self.button.clicked.connect(self.start_task)
layout = qvboxlayout()
layout.addwidget(self.label)
layout.addwidget(self.button)
self.setlayout(layout)
def start_task(self):
worker = worker()
worker.signals.progress.connect(self.update_label)
self.thread_pool.start(worker)
def update_label(self, value):
self.label.settext(f"进度: {value}")
app = qapplication([])
window = mainwindow()
window.show()
app.exec_()3.concurrent
from pyqt5.qtcore import pyqtsignal, qobject
from pyqt5.qtwidgets import qapplication, qlabel, qvboxlayout, qwidget, qpushbutton
from concurrent.futures import threadpoolexecutor
import time
class worker(qobject):
progress = pyqtsignal(int)
def do_work(self):
for i in range(1, 101):
time.sleep(0.021) # 模拟耗时操作
self.progress.emit(i)
class mainwindow(qwidget):
def __init__(self):
super().__init__()
self.resize(800, 600)
self.initui()
self.executor = threadpoolexecutor(max_workers=10)
def initui(self):
self.label = qlabel("进度: 0")
self.button = qpushbutton("开始任务")
self.button.clicked.connect(self.start_task)
layout = qvboxlayout()
layout.addwidget(self.label)
layout.addwidget(self.button)
self.setlayout(layout)
def start_task(self):
self.worker = worker()
self.worker.progress.connect(self.update_label)
self.executor.submit(self.worker.do_work)
def update_label(self, value):
self.label.settext(f"进度: {value}")
app = qapplication([])
window = mainwindow()
window.show()
app.exec_()总结
qthread：适合需要自定义线程逻辑的场景。qrunnable + qthreadpool：适合轻量级、高并发任务。concurrent.futures：简单结合信号与槽机制使用线程池。
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