如何通过按下按钮从QLineEdit（）pyqt5获取值

Question

I have created the QLineEdit object and trying to get valuse from this widget, but at the end I've got an error:

qlineedit1 = QLineEdit()
qlineedit1.setFixedSize(btn_x_size, btn_y_size)
gridLayout.addWidget(qlineedit1, i, j)        
value = range_btn.clicked.connect(self.get_value(qlineedit1))

@pyqtSlot()
def get_text(self, obj):
    textboxValue = obj.text()
    return textboxValue

---

    text1 = range_btn.clicked.connect(self.get_text(qlineedit1))
TypeError: argument 1 has unexpected type 'str'

Answer 1

Your errors are the following:

• To the connect() method you must put the name of the function, not the evaluated function.

• the connection does not return anything, so value will always be None.

The GUI s work asynchronously because they want to obtain the data in the connection is not valid, you must obtain it in the slot.

if you want to pass additional parameters you could use the lambda function:

    qlineedit1 = QLineEdit()
    qlineedit1.setFixedSize(btn_x_size, btn_y_size)
    gridLayout.addWidget(qlineedit1, i, j)        
    range_btn.clicked.connect(lambda checked, obj=qlineedit1 : self.get_value(obj))

@pyqtSlot()
def get_text(self, obj):
    textboxValue = obj.text()
    print(textboxValue)