Simple printing the text for a QLineEdit

[deanhystad]

This:

self.cfButton.clicked.connect(print(serialNumber))

calls the print function and connects "clicked" to the return value, which is None. You need to connect "clicked" to a function, not a function call. This would work.

def print_serialnumber():
    print(self.snTextBox.text())
...
self.cfButton.clicked.connect(print_serialnumber)

If you don't want to write a function, you can use a lambda expression, essentially an in-line function.

self.cfButton.clicked.connect(lambda: print(self.snTextBox.text())

In the future please provide enough of an example that others can run the code.

And for widgets that you will never reference, there is no need to keep a reference in your class. Will you ever use snLabel, modelLabel or userLabel?

        layout = QVBoxLayout(self)
        layout.addWidget(QLabel("SERIAL NUMBER"))
        layout.addWidget(self.snTextBox)
        layout.addWidget(QLabel("MODEL"))
        layout.addWidget(self.modelTextBox)
        layout.addWidget(QLabel("USER"))
        layout.addWidget(self.userTextBox)
        layout.addWidget(self.activeCheckbox)
        layout.addWidget(self.enButton)
        layout.addWidget(self.cfButton)
        layout.addWidget(self.seButton)