[prev in list] [next in list] [prev in thread] [next in thread] 

List:       pykde
Subject:    mypy complains that QAbstractItemModel.modelReset is a function, not a signal
From:       Anton Yablokov <stsav012 () gmail ! com>
Date:       2021-05-16 9:58:03
Message-ID: CABrj0DM9YcuWa=sg0D-VoYRVW2OQPpUDwJA4SVyGqeYYVJMqww () mail ! gmail ! com
[Download RAW message or body]

Dear developers,

I'm not sure whether it's right to address you about the issue but anyway.

I have the following class:
class DataModel(QAbstractTableModel):
    def __init__(self, parent: Optional[QObject]) -> None:
        super().__init__(parent)
        self._data: np.ndarray = np.empty((0, 0))
        self._header: List[str] = []

    def rowCount(self, parent: Optional[QModelIndex] = None, *,
available_count: bool = False) -> int:
        if available_count:
            return self._data.shape[0]
        return min(self._data.shape[0], self._rows_loaded)

    def columnCount(self, parent: Optional[QModelIndex] = None) -> int:
        return self._data.shape[1]

    def data(self, index: QModelIndex, role: int = Qt.DisplayRole) ->
Optional[str]:
        if index.isValid() and role == Qt.DisplayRole:
            return repr(self._data[row_index, column_index])
        return None

    def headerData(self, col: int, orientation: Qt.Orientation, role: int =
Qt.DisplayRole) -> Optional[str]:
        if orientation == Qt.Horizontal and role == Qt.DisplayRole and 0 <=
col < len(self._header):
            return self._header[col]
        return None

    def setHeaderData(self, section: int, orientation: Qt.Orientation,
value: str, role: int = Qt.DisplayRole) -> bool:
        if orientation == Qt.Horizontal and role == Qt.DisplayRole and 0 <=
section < len(self._header):
            self._header[section] = value
            return True
        return False

So, I create
model = DataModel()
Then I connect its signal to a slot:
model.modelReset.connect(lambda: print('modelReset'))

And that's where mypy sees an error:
error: "Callable[[], None]" has no attribute "connect"

Apparently, it's the matter of a stub, for the code works just fine.

It's merely an issue, for mypy can be told to ignore it.

Thanks!

Best regards,
Anton
🍏

[Attachment #3 (text/html)]

<div dir="ltr"><div>Dear developers,</div><div><br></div><div>I&#39;m not sure \
whether it&#39;s right to address you about the issue but \
anyway.</div><div><br></div><div>I have the following class:</div><div><span \
style="font-family:monospace">class DataModel(QAbstractTableModel):<br>      def \
__init__(self, parent: Optional[QObject]) -&gt; None:<br>            \
super().__init__(parent)<br>            self._data: np.ndarray = np.empty((0, 0))<br> \
self._header: List[str] = []</span></div><br><div><span \
style="font-family:monospace">      def rowCount(self, parent: Optional[QModelIndex] \
= None, *, available_count: bool = False) -&gt; int:<br>            if \
available_count:<br>                  return self._data.shape[0]<br>            \
return min(self._data.shape[0], self._rows_loaded)<br><br>      def columnCount(self, \
parent: Optional[QModelIndex] = None) -&gt; int:<br>            return \
self._data.shape[1]<br><br>      def data(self, index: QModelIndex, role: int = \
Qt.DisplayRole) -&gt; Optional[str]:<br>            if index.isValid() and role == \
Qt.DisplayRole:<br>                  return repr(self._data[row_index, \
column_index])</span></div><div><span style="font-family:monospace">            \
return None<br><br>      def headerData(self, col: int, orientation: Qt.Orientation, \
role: int = Qt.DisplayRole) -&gt; Optional[str]:<br>            if orientation == \
Qt.Horizontal and role == Qt.DisplayRole and 0 &lt;= col &lt; len(self._header):<br>  \
return self._header[col]<br>            return None<br><br>      def \
setHeaderData(self, section: int, orientation: Qt.Orientation, value: str, role: int \
= Qt.DisplayRole) -&gt; bool:<br>            if orientation == Qt.Horizontal and role \
== Qt.DisplayRole and 0 &lt;= section &lt; len(self._header):<br>                  \
self._header[section] = value<br>                  return True<br>            return \
False</span></div><div><br></div><div>So, I create</div><div><span \
style="font-family:monospace">model = DataModel()</span></div><div>Then I connect its \
signal to a slot:</div><div><span \
style="font-family:monospace">model.modelReset.connect(lambda: \
print(&#39;modelReset&#39;))</span><br><br></div><div>And that&#39;s where <span \
style="font-family:monospace">mypy</span> sees an error:</div><div><span \
style="font-family:monospace">error: &quot;Callable[[], None]&quot; has no attribute \
&quot;connect&quot;</span></div><div><br></div><div>Apparently, it&#39;s the matter \
of a stub, for the code works just fine.</div><div><br></div><div>It&#39;s merely an \
issue, for <span style="font-family:monospace">mypy</span> can be told to ignore \
it.</div><div><br></div><div>Thanks!</div><div><br></div><div>Best \
regards,</div><div>Anton<br></div><div><div><div dir="ltr" class="gmail_signature" \
data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div \
dir="ltr"><font size="6">🍏</font><br></div></div></div></div></div></div></div></div></div>




[prev in list] [next in list] [prev in thread] [next in thread]