How to implement time delays in PyQt applications without freezing the GUI?

Time.sleep Alternative in PyQt Applications

In PyQt applications, using time.sleep is not recommended as it can freeze the GUI thread, The interface becomes unresponsive. Therefore, other methods need to be found to implement delayed operations.

QTimer Usage

QTimer provides delay function, but it usually needs to be associated with other functions. In other words, the specified function will be executed after the delay. If you only need a delay within the current function, you'll need another approach.

QtTest.qWait()

The QtTest module provides the qWait() method, which can be used as a replacement for time.sleep without freezing the GUI thread.

Example:

from PyQt4 import QtTest

def num(self):
    for i in range(1, 999):
        print(i)
        QtTest.QTest.qWait(10)  # Delay in milliseconds

This method can implement delayed operations while keeping the GUI responsive.

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