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Forum Update on Monday, May 27th 2025

Star Delegate Example error in python 3.7

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  • A Offline
    A Offline
    alom
    wrote on 12 Jan 2020, 00:00 last edited by
    #1

    I've set up the star delegate example, with runs fine under python 2.7 but under 3.7 running into:

    Traceback (most recent call last):
      File "Z:\repos\qtPlayGround\QStyledItemDelegate_Start_Example\starEditor.py", line 25, in sizeHint
        return self.starRating.sizeHint()
    AttributeError: 'StarEditor' object has no attribute 'starRating'
    

    I saw that Python 3 only has new-style classes but is there something that needs to change in the StarEditor class? I'm a bit lost as everything looks fine.

    Cheers

    start delegate files:
    https://doc.qt.io/qtforpython/pyside-examples/pyside2examples-widgets-itemviews-stardelegate-example.html#pyside2-qtwidgets-star-delegate-example

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    • S Offline
      S Offline
      SGaist
      Lifetime Qt Champion
      wrote on 12 Jan 2020, 19:31 last edited by
      #2

      Hi,

      How are you running the code exactly ?

      I see where the issue is but I'd like to know how you trigger it.

      Interested in AI ? www.idiap.ch
      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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      • A Offline
        A Offline
        alom
        wrote on 12 Jan 2020, 21:15 last edited by alom 1 Dec 2020, 21:20
        #3

        @SGaist
        I just have the three files in a pycharm project and running the stardelegate.py file.
        The error pop up once I enter the edit state of the star cell

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        • S Offline
          S Offline
          SGaist
          Lifetime Qt Champion
          wrote on 12 Jan 2020, 22:31 last edited by
          #4

          Then something else must be off.

          In any case, add

          from starrating import StarRating
          

          Before the the StarEditor class declaration and then

          self.starRating = StarRating()
          

          in its constructor.

          A fix to the example has been submitted.

          Interested in AI ? www.idiap.ch
          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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          • A Offline
            A Offline
            alom
            wrote on 12 Jan 2020, 22:44 last edited by
            #5

            @SGaist
            Thanks! working.
            Any idea why python 2.7 wasn't throwing this error?

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            • S Offline
              S Offline
              SGaist
              Lifetime Qt Champion
              wrote on 13 Jan 2020, 08:01 last edited by
              #6

              No I don't.

              I checked with with Python 3.7.6 and the example runs without my change because of how python works and the sequence of actions that will trigger the use of that attribute. The starRating attribute should have been set prior to being used in any case so there might be something different on your system but I don't know what it is.

              Interested in AI ? www.idiap.ch
              Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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