qtpy exception (setResizeMode is only available in Qt4)

[sergirubio]

It seems that a deprecated Qt4 method is called:

File "/home/sicilia/src/taurus/lib/taurus/qt/qtgui/table/taurusdevicepropertytable.py", line 186, in updateStyle
QtGui.QHeaderView.ResizeToContents) # .Stretch)
File "/usr/lib/python2.7/dist-packages/qtpy/_patch/qheaderview.py", line 83, in setResizeMode
raise Exception('setResizeMode is only available in Qt4. Use '
Exception: setResizeMode is only available in Qt4. Use setSectionResizeMode instead.

[sergirubio]

Same error on TaurusValuesTable

Traceback (most recent call last):
File "/home/sicilia/src/taurus/lib/taurus/qt/qtgui/base/taurusbase.py", line 319, in filterEvent
self.handleEvent(*evt)
File "/home/sicilia/src/taurus/lib/taurus/qt/qtgui/table/taurusvaluestable.py", line 726, in handleEvent
hh.setResizeMode(Qt.QHeaderView.Fixed)
File "/usr/lib/python2.7/dist-packages/qtpy/_patch/qheaderview.py", line 83, in setResizeMode
raise Exception('setResizeMode is only available in Qt4. Use '
Exception: setResizeMode is only available in Qt4. Use setSectionResizeMode instead.

[cpascual]

This is strange...
I was not aware that we are (yet) be using qtpy in Taurus (maybe I forgot?).

Taurus should be only using PyQt4 for now... I wonder if there is something unusual in your installation?

That said, it is interesting to note these kind of warnings since we are eventually going to have to deal with them.

[cpascual]

Note:" the same exception can be triggered on a debian9 by e.g.,

taurusform sys/tg_test/1/boolean_spectrum

... but it does not happen if using python -m taurus.qt.qtgui.table.taurusvaluestable

(so I assume that qtpy is being loaded when using taurusform)

Also note that the suggestion to use setSectionResizeMode does not work when qtpy is not imported, since setSectionResizeMode is not present in Qt4

[cpascual]

Can anybody help in reproducing the problem (of loading qtpy) with an small snippet?

[cpascual]

Here is a smaller snippet for reproducing the exception.
(it seems that importing the taurus.qt.qtgui.editor module triggers the issue)

from taurus.external.qt import Qt
from taurus.qt.qtgui.application import TaurusApplication
app = TaurusApplication()

# Commenting this import makes the exception disappear
from taurus.qt.qtgui.editor import TaurusBaseEditor

Qt.QHeaderView(Qt.Qt.Vertical).setResizeMode(Qt.QHeaderView.Fixed)

Running it one gets:

Traceback (most recent call last):
  File "/home/cpascual/src/tests/taurus/bug401.py", line 9, in <module>
    Qt.QHeaderView(Qt.Qt.Vertical).setResizeMode(Qt.QHeaderView.Fixed)
  File "/usr/lib/python2.7/dist-packages/qtpy/_patch/qheaderview.py", line 83, in setResizeMode
    raise Exception('setResizeMode is only available in Qt4. Use '
Exception: setResizeMode is only available in Qt4. Use setSectionResizeMode instead.

[cpascual]

It looks like this is a bug introduced by qtpy.
qtpy has side effects even when you do not import it directly:
spyder-ide/qtpy#65 (comment)

[cpascual]

I created an issue in qtpy:
spyder-ide/qtpy#119

[cpascual]

As a workaround in the meanwhile we could do the ugly thing of trying setSectionResizeMode before defaulting to setResizeMode (note that we have to try both because we cannot predict whether the user has already imported qtpy or not when we want to do the resize).

Or, alternatively, we could do an early import of qtpy in taurus.qt to make sure that the intrusive patching is done (note that this is just pushing the same problem towards taurus users, whose code could be broken)

[cpascual]

I finally opted for the "early import" workaround. See #473