title: How to make a QPushButton disabled
body: <p>I created lots of <a href="http://qt-project.org/doc/qt-5.0/qtwidgets/qpushbutton.html" rel="noreferrer">QPushButtons</a>, added clicked signal and a slot name ´deneme()´ to all of the buttons with <code>QT DESIGNER</code> and the thing I want to do is; when I clicked any button, some operation should be done and lastly the button should be disabled but we do not know which button is clicked. I know I can disable the buttons with <code>setEnabled()</code> and <code>isEnabled()</code> but I do not know how to disable them.</p>