PyQt，QThread，GIL，GUI
问题内容：
我有用Python编写的GUI和程序逻辑。我urllib.requests经常通过调用（等等）从Web请求信息，这在GUI无响应但此调用用包裹时会引起问题QThread。我认为这是因为发生GIL。但是，当我不能QThread在PyQt应用程序中使用时，PyQt如果我不能使代码异步工作，该如何使用呢？
- 编码 -
qtthreaddecorator.py:
from PyQt4 import QtCore
class Worker(QtCore.QThread):
def __init__(self, thread_name, finished_slot, function, *args, **kwargs):
QtCore.QThread.__init__(self)
self._thread_name = thread_name
self._function = function
self._args = args
self._kwargs = kwargs
self._finished_slot = finished_slot
def run(self):
self._function(*self._args, **self._kwargs)
self._finished_slot()
return
def qt_thread_decorator(slot):
def decorator(function):
def wrapper(*args, **kwargs):
worker = Worker(function.__name__, slot, function, *args, **kwargs)
worker.start()
return
return wrapper
return decorator
还有我使用它的地方：
import qtthreaddecorator
class MainWindow(QtGui.QMainWindow, form_class):
def __init__(self, parent=None):
QtGui.QMainWindow.__init__(self, parent)
self.setupUi(self)
self.init()
def init(self):
@qtthreaddecorator.qt_thread_decorator(self._fill_servers)
def _get_servers():
self._get_my_servers()
@qtthreaddecorator.qt_thread_decorator(self._fill_user_info)
def _get_user_info():
self._get_user_info()
_get_servers()
_get_user_info()
在我的情况，_get_servers()并_get_user_info()呼吁为了，但我想同时执行它们。
问题答案：
我认为您在使用装饰器方面过于复杂。您可以使用大约3-4行设置代码轻松地将代码包装在新线程中。另外，我不认为您应该直接从另一个线程调用完成的插槽。您应该使用连接的信号将其激活。
import sys
from time import sleep
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
class Signals(QObject):
update = pyqtSignal(int)
enable_button = pyqtSignal(bool)
class Window(QWidget):
def __init__(self, *args, **kwargs):
QWidget.__init__(self, *args, **kwargs)
self.button = QPushButton("Run", self)
self.button.clicked.connect(self.onButton)
self.progress = QProgressBar(self)
self.progress.setTextVisible(False)
self.layout = QVBoxLayout()
self.layout.setContentsMargins(5, 5, 5, 5)
self.layout.addWidget(self.button)
self.layout.addWidget(self.progress)
self.layout.addStretch()
self.worker_thread = QThread()
self.worker_thread.run = self.worker
self.worker_thread.should_close = False
self.signals = Signals()
self.signals.update.connect(self.progress.setValue)
self.signals.enable_button.connect(self.button.setEnabled)
self.setLayout(self.layout)
self.show()
self.resize(self.size().width(), 0)
# Override
def closeEvent(self, e):
self.worker_thread.should_close = True
self.worker_thread.wait()
@pyqtSlot()
def onButton(self):
self.button.setDisabled(True)
self.worker_thread.start()
# Worker thread, no direct GUI updates!
def worker(self):
for i in range(101):
if self.worker_thread.should_close:
break
self.signals.update.emit(i)
sleep(0.1)
self.signals.enable_button.emit(True)
app = QApplication(sys.argv)
win = Window()
sys.exit(app.exec_())
