i try to use value from txtbox in Window1 in other Class by click button in Window1 i tried more than 100 ways but still not wroking! how can i get values of txtbox in Window1 when i click button and get run callstock and in callstock first i get value of textbox from Window1 note : code works fine when i set value "example" but i cant get that value from class Window1

class Window1(QWidget):
    def __init__(self):
        super().__init__()
        self.setGeometry(550,200,500,500)
        self.setWindowTitle('program')
        self.UI()

    def UI(self):
        self.txtbox = QLineEdit(self)
        self.txtbox.move(150,10)
        self.txtbox.setPlaceholderText("name")
        btnfind = QPushButton("Find",self)
        btnfind.move(175,35)
        btnfind.clicked.connect(self.getValues)
        self.show()
    def sendval(self):
        txt = self.txtbox.text()
        return txt
    def getValues(self):
        self.newB = callstock()

class callstock(QWidget):
    def __init__(self):
        super().__init__()
        wi = Window1.sendval(self)
        self.setWindowTitle(wi)
        self.setGeometry(10,10,500,500)
        self.UI()
        self.figview1 = showchart1(name=wi,day=200)
        self.figview1.setGeometry(10,10,500,500)
        self.figview1.move(0,0)
        self.figview1.show()
    def UI(self):
        pass

def main():
    app = QApplication(sys.argv)
    window = Window1()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

CodePudding user response：

You have to send instance of first class to second class as argument - in your code it will be self which means instance of Window1

   self.newB = callstock(self)

And second class has to get it - ie. as other_class

class callstock(QWidget):
    
    def __init__(self, other_class):    # <-- get instance in `other_class`
        super().__init__()
        
        wi = other_class.txtbox.text()  # <-- use it 

Minimal working code:

from PyQt5.Qt import *

class Window1(QWidget):
    
    def __init__(self):
        super().__init__()
        self.setGeometry(550, 200, 500, 500)  # PEP8: space after comma
        self.setWindowTitle('program')
        self.UI()

    def UI(self):
        self.txtbox = QLineEdit(self)
        self.txtbox.move(150, 10)  # PEP8: space after comma
        self.txtbox.setPlaceholderText("name")
        
        btnfind = QPushButton(self, text="Find")  # PEP8: space after comma
        btnfind.move(175, 35)  # PEP8: space after comma
        btnfind.clicked.connect(self.getValues)
        
        self.show()

    def getValues(self):
        self.newB = CallStock(self)  # <-- send instance of `Window1` as argument


class CallStock(QWidget):  # PEP8: `CamelCaseName` for classes
    
    def __init__(self, other_class):    # <-- get instance in variable `other_class`
        super().__init__()
        
        wi = other_class.txtbox.text()  # <-- use it
        
        self.setWindowTitle(wi)
        self.setGeometry(10, 10, 500, 500)  # PEP8: space after comma
        self.UI()

        self.figview1 = QLabel(self, text="Text from Window1: "   wi)
        #self.figview1 = showchart1(name=wi, day=200)  # PEP8: space after comma
        self.figview1.setGeometry(10, 10, 500, 500)  # PEP8: space after comma
        self.figview1.move(0, 0)  # PEP8: space after comma
        self.figview1.show()
        
        self.show()
        
    def UI(self):
        pass

def main():
    app = QApplication([])
    window = Window1()
    app.exec()

if __name__ == '__main__':
    main()

PEP 8 -- Style Guide for Python Code

EDIT:

You could also send only text instead of full instance

    self.newB = CallStock(self.txtbox.text())

and

class CallStock(QWidget):  # PEP8: `CamelCaseName` for classes
    
    def __init__(self, wi):  # <-- get text in variable `wi`

Minimal working code:

from PyQt5.Qt import *

class Window1(QWidget):
    
    def __init__(self):
        super().__init__()
        self.setGeometry(550, 200, 500, 500)  # PEP8: space after comma
        self.setWindowTitle('program')
        self.UI()

    def UI(self):
        self.txtbox = QLineEdit(self)
        self.txtbox.move(150, 10)  # PEP8: space after comma
        self.txtbox.setPlaceholderText("name")
        
        btnfind = QPushButton(self, text="Find")  # PEP8: space after comma
        btnfind.move(175, 35)  # PEP8: space after comma
        btnfind.clicked.connect(self.getValues)
        
        self.show()

    def getValues(self):
        self.newB = CallStock(self.txtbox.text())


class CallStock(QWidget):  # PEP8: `CamelCaseName` for classes
    
    def __init__(self, wi):
        super().__init__()
        
        self.setWindowTitle(wi)
        self.setGeometry(10, 10, 500, 500)  # PEP8: space after comma
        self.UI()

        self.figview1 = QLabel(self, text="Text from Window1: "   wi)
        #self.figview1 = showchart1(name=wi, day=200)  # PEP8: space after comma
        self.figview1.setGeometry(10, 10, 500, 500)  # PEP8: space after comma
        self.figview1.move(0, 0)  # PEP8: space after comma
        self.figview1.show()
        
        self.show()
        
    def UI(self):
        pass

def main():
    app = QApplication([])
    window = Window1()
    app.exec()

if __name__ == '__main__':
    main()