Connect QWizard.NextButton to custom method only on the first page

I have a three pages wizard. First page is BasicSettings(), second page is InstallPackages() and the last page is Summary().

I want the Next button on the first page to first execute a method named execute_venv_create() and then call the next page. On the following pages, the Next button should behave as usual.

For this I connected the Next button to execute_venv_create() like this:

class VenvWizard(QWizard):
    """The wizard class."""
    def __init__(self):
        super().__init__()
        # ...

class BasicSettings(QWizardPage):
    """This is the first page."""
    def __init__(self):
        super().__init__()
        # ...

    def initializePage(self):
        next_button = self.wizard().button(QWizard.NextButton)
        next_button.clicked.connect(self.execute_venv_create)

    def execute_venv_create(self):
        # do something, then display an info message
        QMessageBox.information(self, "Done", "message text")

The problem is that of course the method is called every time I click Next and therefore I tried to disconnect the button and reconnect it to the QWizard.next() method in this way:

class InstallPackages(QWizardPage):
    """This is the second page."""
    def __init__(self):
        super().__init__()
        # ...

    def initializePage(self):
        next_button = self.wizard().button(QWizard.NextButton)
        next_button.disconnect()
        next_button.clicked.connect(QWizard.next)

On the first page the Next button works as I expect, it calls the method and switches to the next page. But then, on the second page InstallPackages(), the GUI crashes if I click Next.

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Is this the right way to connect a QWizard button to a custom method or is it not possible to use wizard buttons from QWizardPages?

How to connect the QWizard.NextButton to a custom method of a specific QWizardPage and make the button behave as usual on the following pages?

Your method is correct but you have to use the QWizard object associated with the page that can be obtained through the wizard() method:

def execute_venv_create(self):
    # do something, then display an info message
    QMessageBox.information(self, "Done", "message text")
    next_button = self.wizard().button(QWizard.NextButton)
    next_button.disconnect()
    next_button.clicked.connect(self.wizard().next)