[PyQt] problems porting a project from sip4 to sip5

Phil Thompson phil at riverbankcomputing.com
Sat Apr 18 10:53:04 BST 2020

On 17/04/2020 19:42, Steve Borho wrote:
>> On Apr 17, 2020, at 3:51 AM, Phil Thompson 
>> <phil at riverbankcomputing.com> wrote:
>> On 16/04/2020 23:52, Steve Borho wrote:
>>> Hello,
>>> I maintain a couple of relates SIP projects that I am trying to port
>>> to sip5 and binary wheel distributions.  To keep things simple, lets
>>> say there is a C++ library for a widget foo, and Python wrappers that
>>> we’ll call pyfoo.
>>> I have written a pyproject.toml for pyfoo such that sip-wheel can
>>> generate wheels which install a “foo” python package containing a
>>> pyfoo.so shared library. This wheel is 100% functional.
>>> Next I have a fooapp which uses PyQt5 and has its own C++ functions
>>> which compile against Qt and the foo C++ library.  This gets compiled
>>> into qtfoo.so and it’s SIP wrapper includes:
>>> %Import QtGui/QtGuimod.sip
>>> %Import QtWidgets/QtWidgetsmod.sip
>>> %Import QtNetwork/QtNetworkmod.sip
>>> %Import foomod.sip
>>> I have written a pyproject.toml for fooapp that sip-build can compile
>>> into a qtfoo.so and sip-wheel can create a wheel for it.  But no
>>> matter how I try and load the qtfoo.so it always errors with the
>>> message:
>>>    from .qtfoo import get_qtfoo_version
>>> RuntimeError: the foo.pyfoo module failed to register with the sip 
>>> module
>>> I get this error even though the previous line of Python code was 
>>> able
>>> to import pyfoo.so from the foo package.  There is a binary 
>>> dependency
>>> here that I can’t determine.
>>> I read the documentation about standalone and package modules, and
>>> followed the steps to make a foo-sip wheel that installs
>>> foo/bindings/pyfoo/foomod.sip and the other sip files, but this did
>>> not seem to help with the library interdependency.
>>> I’m missing something basic, any hints on where to look?
>> https://www.riverbankcomputing.com/static/Docs/PyQt5/pyqt_builder.html
>> Phil
> Thanks for the response.
> On a (barely) related note, is there a clean way in project.py to set
> or override the version value from [tool.sip.metadata]?  I am
> currently wrapping the setup() function of Project and assigning
> self.version_str when it returns, this seem sub-optimal.

...and non-portable as setup() is not part of the documented API.

Are you trying to determine the version dynamically?

I could implement the setuptools 'file' feature so you would write...

version = "file: VERSION"

...and it would read the value from the file "VERSION".


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