Скачать или смотреть 009 PYTHON GUI APPLICATION DEVELOPMENT -- Introduction to QSpinBox Qt Designer

Creating QSpinBox in PyQt6
QSpinBox is designed to handle integers and discrete sets of
values, QSpinBox allows the user to choose a value by clicking the
up/down buttons or pressing up/down on the keyboard to
increase/decrease the value currently displayed. The user can also
type the value in manually.
there are different methods that you can use in QSpinBox for
example we have value() method, and this method returns the
current selected integer value of spinbox, we have setMinimum()
and setMaximum() methods, also there are some signals for
QSpinBox, for example we have valueChanged() signal and it is
emitted when the value of spinbox is changed also we have
editingFinished() signal and it is emitted when the focus is lost on
the spinbox.
These are some more methods for QSpinBox.
 value(): This method returns the current integer value
selection from the QSpinBox class.
 text(): This method is used to display text in the spinbox.
 setPrefix(): This method assigns the prefix text that is
prepended to the value returned by the spin box.
 setSuffix(): This method assigns the suffix text that is to be
appended to the value returned by the spin box.
We can use QSpinBox class for creating of the SpinBox, QSpinBox
class is related to QtWidgets module.
self.spinbox = QSpinBox()
Basically in our example we have used two QLineEdit.
self.lineedit = QLineEdit()
As we have already said that there are different signals that you
can use in QSpinBox class, for example in here we have used
valueChanged() signal of QSpinBox, and it is emitted when the
value of spinbox is changed, we have connected the signal with
the spin_selected() method or slot.
self.spinbox.valueChanged.connect(self.spin_selec
ted)
This is our method or slot, in this method first we are going to
check that if our lineedit is not zero, if that is the case we are
going to get the value from the lineedit and after that we multiply
that with spinbox amount, and at the end we set that to the label
that we have.
def spin_selected(self):
if self.lineedit.text() != 0:
price = int(self.lineedit.text())
totalPrice = self.spinbox.value() * price

self.total_result.setText(str(totalPrice))
else:
print("Wrong value")