Python has stopped working / AttributeError: 'Ui_Form' object has no attribute 'lineEdit'

jerap

I want to set the label in B.py to whatever the user typed in A.py self.lineEdit. However, when I clicked the button in A.py, the application crashed and display this message: Python has stopped working. Then I ran B.py to see what is the problem and this error shows: AttributeError: 'Ui_Form' object has no attribute 'lineEdit'.

A.py

from PyQt6 import QtCore, QtGui, QtWidgets
import B

class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(203, 146)
        self.verticalLayout = QtWidgets.QVBoxLayout(Form)
        self.verticalLayout.setContentsMargins(0, 0, 0, 0)
        self.verticalLayout.setSpacing(0)
        self.verticalLayout.setObjectName("verticalLayout")
        self.lineEdit = QtWidgets.QLineEdit(Form)
        self.lineEdit.setObjectName("lineEdit")
        self.verticalLayout.addWidget(self.lineEdit)
        self.pushButton = QtWidgets.QPushButton(Form)
        self.pushButton.setObjectName("pushButton")
        self.verticalLayout.addWidget(self.pushButton)

        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)

        self.pushButton.clicked.connect(self.enter)
        self.pushButton.clicked.connect(Form.close)

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Form"))
        self.pushButton.setText(_translate("Form", "Enter"))

    def enter(self):
        self.lineedit_txt = self.lineEdit.text()

        self.window_login1 = QtWidgets.QWidget()
        self.ui_login1 = B.Ui_Form()
        self.ui_login1.setupUi2(self.window_login1)
        self.window_login1.show()

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    Form = QtWidgets.QWidget()
    ui = Ui_Form()
    ui.setupUi(Form)
    Form.show()
    sys.exit(app.exec())

B.py

from PyQt6 import QtCore, QtGui, QtWidgets


class Ui_Form(object):
    def setupUi2(self, Form):
        Form.setObjectName("Form")
        Form.resize(400, 300)
        self.verticalLayout = QtWidgets.QVBoxLayout(Form)
        self.verticalLayout.setObjectName("verticalLayout")
        self.label = QtWidgets.QLabel(Form)
        self.label.setText("")
        self.label.setObjectName("label")
        self.verticalLayout.addWidget(self.label)

        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)

        self.output()

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Form"))
      
    def output(self):
        import A
        obj = A.Ui_Form()
        obj.enter()

        txt_for_label = obj.lineedit_txt
        self.label.setText(txt_for_label)

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    Form = QtWidgets.QWidget()
    ui = Ui_Form()
    ui.setupUi2(Form)
    Form.show()
    sys.exit(app.exec())

JonB

@jerap
Let's start with:

# In `A.enter()`
self.ui_login1 = B.Ui_Form()

# In `B.output()`
        import A
        obj = A.Ui_Form()
        obj.enter()

That does not look very promising, crash-wise....

Next: when as above in B.output() you do go

        import A
        obj = A.Ui_Form()
        obj.enter()

you have never gone A.Ui_Form.setupUi() so your A.Form does not have any self.lineEdit, doubtless hence the error message.

Don't know what you're trying to do with this convolution, but you'd better sort your instances of A & B out because I suspect you're failing to understand correctly accessing existing instances and creating new ones afresh without understanding.

jerap

@JonB
What I want to do is to set the text of B.self.label to whatever the user inputs in A.self.lineEdit.

JonB

@jerap
You need to start by sorting out your architecture before that. How are A and B related? Which one shows which one? Is only one at a time supposed to be visible, are they both supposed to be visible all the time? I suggest you don't worry about the label till you have that sorted out.

Then they way to pass information between one and the other will be clearer.