Resize table columns weird warning in PySide6 when disconnecting/connecting function to signal

Question

I have the following function to be able to resize the first two columns of a table in PySide6 while keeping the third the same size since it contains a combobox and keeps the ratios they get of the table widget rectangle even if i make the size of the whole program bigger or smaller

def auto_n_manual_resize(self):
    self.header.setStretchLastSection(False)
    widget_width = self.wordsTable.contentsRect().width()
    column0 = self.header.sectionSize(0)
    column1 = self.header.sectionSize(1)
    scroll = self.wordsTable.verticalScrollBar().sizeHint().width()
    verHeadWidth = self.wordsTable.verticalHeader().sizeHint().width()

    available_width = (
        widget_width - verHeadWidth - scroll - 90
    )  # the 3rd col should be 90 pix wide

    denom = column0 + column1 or 1
    if denom == 0:
        column0 = column1 = 1
        denom = 2
    col0_W_per = column0 / denom
    col1_W_per = column1 / denom

    newCol0Width = int(col0_W_per * available_width)
    newcol1Width = int(col1_W_per * available_width)

    self.header.sectionResized.disconnect(self.auto_n_manual_resize)
    self.wordsTable.setColumnWidth(0, newCol0Width)
    self.wordsTable.setColumnWidth(1, newcol1Width)
    self.wordsTable.setColumnWidth(2, 90)
    self.header.sectionResized.connect(self.auto_n_manual_resize)

    self.header.setMinimumSectionSize(60)
    self.header.setMaximumSectionSize((available_width))

    self.header.setStretchLastSection(True)

the code works "perfectly" as far as I can see, but i get this warning when I run the program

RuntimeWarning: Failed to disconnect (<bound method Table.auto_n_manual_resize of <widgets.Table(0x20d074122a0) at 0x0000020D07ADD280>>) from signal "sectionResized(int,int,int)".

which is the weird part cause before I placed the disconnect and connect methods when I resized the columns they weren't constrained to the visible rectangle of the table but would immediately expand beyond and I would get a horizontal scrollbar but then would snap back to the visible rectangle of the table when i resized the whole window of the program, so it essence it works but I get this warning and I don't know what to do

It's probably a recursion error, possibly caused by calling setStretchLastSection(), which will trigger again sectionResized. In cases like these, where the connected function potentially causes itself to be called again, it's normally better to use an internal "flag" that needs to be checked before doing anything. Try setting a class attribute (eg: _recursionCheck = False), then at the beginning of the function add if self._recursionCheck: return, followed by self._recursionCheck = True before the rest of the function, and concluding it with self._recursionCheck = False. — musicamante
– musicamante, Commented Jul 23 at 14:52
By doing that, the disconnect/connect procedure becomes less relevant, but you can still leave it to avoid unnecessary calls. — musicamante
– musicamante, Commented Jul 23 at 14:54

Tar-Eruntalion · Accepted Answer · 2025-07-24 12:34:37Z

OK so the answer was partially thanks to @musicamante and partially thanks to AI, so I wrote in my table class init this code

self.header.sectionResized.connect(self.auto_n_manual_resize)

then wrote the class attribute _recursionCheck = False

and then modifies the resize method to this

    def auto_n_manual_resize(self):
        if self._recursionCheck:
            return
        self._recursionCheck = True
        self.header.setStretchLastSection(False)
        widget_width = self.wordsTable.contentsRect().width()
        column0 = self.header.sectionSize(0)
        column1 = self.header.sectionSize(1)
        scroll = self.wordsTable.verticalScrollBar().sizeHint().width()
        verHeadWidth = self.wordsTable.verticalHeader().sizeHint().width()

        available_width = (
            widget_width - verHeadWidth - scroll - 90
        )  # the 3rd col should be 90 pix wide

        denom = column0 + column1 or 1
        if denom == 0:
            column0 = column1 = 1
            denom = 2
        col0_W_per = column0 / denom
        col1_W_per = column1 / denom

        newCol0Width = int(col0_W_per * available_width)
        newcol1Width = int(col1_W_per * available_width)

        self.wordsTable.setColumnWidth(0, newCol0Width)
        self.wordsTable.setColumnWidth(1, newcol1Width)
        self.wordsTable.setColumnWidth(2, 90)

        self.header.setMinimumSectionSize(60)
        self.header.setMaximumSectionSize((available_width))

        self.header.setStretchLastSection(True)
        self._recursionCheck = False

so now with the recursion check from @musicamante to prevent any recursion loop errors and moving the resize connection to init that gets called only once per resize without any connection/disconnection the program runs without any warning or error

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