Value from class to class

[sashup]

How to pass value mean from class to class? I try to do it with the help of class parametrs but It doesn't work.

class ClassesPage1(QtWidgets.QWizardPage):
    ...
    def check(self):
        a = 0
        for checkBox in self.listCheckBox:
            if checkBox.isChecked():
                a += 1
        mean = a / 4

        if mean == 1:
            self.label_1.setText('Avarage: 1')
        elif mean == 0:
            self.label_1.setText('Avarage: 0')
        else:
            self.label_1.setText('Avarage:  ' + str(mean))

    def nextId(self):
        return Wizard.class4

class parametrs:
    par = ClassesPage1()
    print par.mean

[jsulm]

@sashup "mean" is local variable and only exists inside def check(self). It needs to be class member (self.mean) if you want to use it outside of def check(self).

[sashup]

@jsulm
somethig like?

    def check(self):
        a = 0
        for checkBox in self.listCheckBox:
            if checkBox.isChecked():
                a += 1
        self.mean = a / 4

        if self.mean == 1:
            self.label_1.setText('Avarage: 1')
        elif self.mean == 0:
            self.label_1.setText('Avarage: 0')
        else:
            self.label_1.setText('Avarage:' + str(self.mean))

[jsulm]

@sashup said in Value from class to class:

somethig like?

Yes, just try...

[sashup]

@jsulm
Then in the second class I write:

class parametrs:
    def __init__(self, *args, **kwargs):
        super(parametrs, self).__init__(*args, **kwargs)
        print(self.mean)

But It doesn't work

[jsulm]

@sashup said in Value from class to class:

But It doesn't work

Of course not. This code does not make sense.
"mean" is member of the class ClassesPage1, right? So, how should self.mean work in a completely different class?
Why did you change parametrs class? Before it was

class parametrs:
    par = ClassesPage1()
    print par.mean

and this version should work now.

Also, keep in mind that currently self.mean only exists if check() was executed!

You should really read a book about Python as you're asking basic questions completely unrelated to Qt.

[sashup]

@jsulm Thank you but it doesn't work too

[jsulm]

@sashup Then please show your current code and write what exactly happens instead of writing that it "doesn't work"...

[sashup]

@jsulm print par.mean doesn't give any values

class ClassesPage1(QtWidgets.QWizardPage):
    def __init__(self, *args, **kwargs):
        super(ClassesPage1, self).__init__(*args, **kwargs)

        font = QtGui.QFont()
        font.setFamily("Sitka")
        font.setPointSize(14)
        self.setFont(font)

        self.label_3 = QLabel("...", self)
        self.label_3.setAlignment(Qt.AlignCenter)

        self.label_4 = QLabel("...", self)
        self.label_4.setAlignment(Qt.AlignBottom)

        self.checkBox_1 = QtWidgets.QCheckBox('...')
        self.checkBox_2 = QtWidgets.QCheckBox('...')
        self.checkBox_3 = QtWidgets.QCheckBox('...')
        self.checkBox_4 = QtWidgets.QCheckBox('...')
        self.label_1 = QtWidgets.QLabel('Avarage: 0')
        #self.label_1.setAlignment(Qt.AlignLeft)

        self.layout = QtWidgets.QVBoxLayout()
        self.layout.addWidget(self.label_3)
        self.layout.addWidget(self.label_4)
        self.layout.addWidget(self.checkBox_1)
        self.layout.addWidget(self.checkBox_2)
        self.layout.addWidget(self.checkBox_3)
        self.layout.addWidget(self.checkBox_4)
        self.layout.addWidget(self.label_1)
        self.setLayout(self.layout)

        self.performance()
        self.listCheckBox = [self.checkBox_1, self.checkBox_2, self.checkBox_3, self.checkBox_4]

    def performance(self):
        self.checkBox_1.stateChanged.connect(self.check)
        self.checkBox_2.stateChanged.connect(self.check)
        self.checkBox_3.stateChanged.connect(self.check)
        self.checkBox_4.stateChanged.connect(self.check)

    def check(self):
    
            a = 0
    
            for checkBox in self.listCheckBox:
    
                if checkBox.isChecked():
    
                    a += 1
    
            self.mean = a / 4
    
    
    
            if self.mean == 1:
    
                self.label_1.setText('Avarage: 1')
    
            elif self.mean == 0:
    
                self.label_1.setText('Avarage: 0')
    
            else:
    
                self.label_1.setText('Avarage:' + str(self.mean))xtId(self):
        return Wizard.class4

class parametrs:
    par = ClassesPage1()
    print par.mean

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    w = ClassesPage1()
    w.show()
    sys.exit(app.exec_()) 

[jsulm]

@sashup I already wrote that self.mean is only set if def check(self) was executed at least once. Do you realise that?
This should work:

class parametrs:
    par = ClassesPage1()
    par.check()
    print par.mean

[sashup]

@jsulm It was solved like

import sys
from PyQt5 import QtCore, QtGui, QtWidgets


class ClassesPage1(QtWidgets.QWizardPage):
    def __init__(self, parent=None):                                         
        super(ClassesPage1, self).__init__()
        self.setTitle("...")
        self.setSubTitle("...")

        self.label_1 = QtWidgets.QLabel('label_1')

        self.checkBox_1 = QtWidgets.QCheckBox('cb1 ...')
        self.checkBox_2 = QtWidgets.QCheckBox('cb2 ...')
        self.checkBox_3 = QtWidgets.QCheckBox('cb3 ...')
        self.checkBox_4 = QtWidgets.QCheckBox('cb4 ...')

        self.layout = QtWidgets.QVBoxLayout()
        self.layout.addWidget(self.checkBox_1)
        self.layout.addWidget(self.checkBox_2)
        self.layout.addWidget(self.checkBox_3)
        self.layout.addWidget(self.checkBox_4)
        self.layout.addWidget(self.label_1)
        self.setLayout(self.layout)

        self.checkBox_1.stateChanged.connect(self.check)
        self.checkBox_2.stateChanged.connect(self.check)
        self.checkBox_3.stateChanged.connect(self.check)
        self.checkBox_4.stateChanged.connect(self.check)
        
        self.listCheckBox = [self.checkBox_1, self.checkBox_2, self.checkBox_3, self.checkBox_4] 
        self.a = 0  
        
        self.parent = parent                                                 
        self.mean = 0                                                         
        
    
    def check(self):
        self.a = 0                                                             
        for checkBox in self.listCheckBox:
            if checkBox.isChecked():
                self.a += 1                                                    
        self.mean = self.a / 4                                                
             
        self.label_1.setText(f'Avarage: {self.mean}')                 
        self.parent._print()                                                  

    def nextId(self):
        return Wizard.class4


class Parametrs:
    def __init__(self):
        super().__init__()
        
        self.par = ClassesPage1(self)
        self.par.show()
        print(f'__init__: par.mean = {self.par.mean}')
    
    def _print(self):
        print(f'par.mean = {self.par.mean:.2f}')
     
    
if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    w = Parametrs()
    sys.exit(app.exec_())