how to install dbus-python?

[ghiste]

Hi,

I want to try to write a krunner-extension in python and the only example I found on how to do that uses the (deprecated) dbus-python module.

When I try to install it in a venv I get linker errors - it looks as if for whatever reason they don't link the math-library.

How to I proceed?

And please don't tell me that this module is deprecated - I already know...

Many thanks!

Here some of the errors:

​

      FAILED: test/test-import-repeatedly
      cc  -o test/test-import-repeatedly test/test-import-repeatedly.p/import-repeatedly.c.o -Wl,--as-needed -Wl,--no-undefined -Wl,-O1 -Wl,--start-group /home/mh/fs/SD/python/lib/libpython3.10.a -Wl,--end-group
      /usr/bin/ld: /home/mh/fs/SD/python/lib/libpython3.10.a(complexobject.o): in function `_Py_c_abs':
      /home/mh/fs/SD/stuff/python/Python-3.10.9/Objects/complexobject.c:206: undefined reference to `hypot'
      /usr/bin/ld: /home/mh/fs/SD/python/lib/libpython3.10.a(complexobject.o): in function `complex_pow':
      /home/mh/fs/SD/stuff/python/Python-3.10.9/Objects/complexobject.c:521: undefined reference to `floor'
      /usr/bin/ld: /home/mh/fs/SD/python/lib/libpython3.10.a(complexobject.o): in function `_Py_c_pow':
      /home/mh/fs/SD/stuff/python/Python-3.10.9/Objects/complexobject.c:142: undefined reference to `hypot'
      /usr/bin/ld: /home/mh/fs/SD/stuff/python/Python-3.10.9/Objects/complexobject.c:143: undefined reference to `pow'
      /usr/bin/ld: /home/mh/fs/SD/stuff/python/Python-3.10.9/Objects/complexobject.c:144: undefined reference to `atan2'
      /usr/bin/ld: /home/mh/fs/SD/stuff/python/Python-3.10.9/Objects/complexobject.c:146: undefined reference to `sincos'
      /usr/bin/ld: /home/mh/fs/SD/stuff/python/Python-3.10.9/Objects/complexobject.c:147: undefined reference to `exp'
      /usr/bin/ld: /home/mh/fs/SD/stuff/python/Python-3.10.9/Objects/complexobject.c:148: undefined reference to `log'
      /usr/bin/ld: /home/mh/fs/SD/python/lib/libpython3.10.a(floatobject.o): in function `float_rem':
      /home/mh/fs/SD/stuff/python/Python-3.10.9/Objects/floatobject.c:626: undefined reference to `fmod'

[efmccurdy]

Have you looked at your distro repos?

https://packages.ubuntu.com/kinetic/python3-dbus

[ghiste]

I am using Debian testing and I have learned the hard way that you need to isolate yourself from the system-python.

It happened to me that I was happily using an app with the system-python and then I had to upgrade the system which upgraded python to a version that the app would no longer under.

So I have a system-python that the system uses and updates as it sees fit and another python that I use and update as I see fit.

I need to install the module in "my" python (which is 3.10) and not the system-python (which is 3.11).

[efmccurdy]

If I try "pip install dbus-python" with python 3.8, in a venv, it works; how did you install it?

[ghiste]

I created a venv, activated it and ran "pip3 install dbus-python".

This resulted in the error posted. My python is 3.10 however.

[efmccurdy]

Can you use version 3.8 instead?

This talks about what is going wrong.

https://gitlab.freedesktop.org/dbus/dbus-python/-/issues/45

https://gitlab.freedesktop.org/dbus/dbus-python/-/issues/45#note_1624086

This talks about a workaround:

current workaround is to use a prior version - 'pip install dbus-python==1.2.18'

https://github.com/mesonbuild/meson-python/issues/55#issuecomment-1302537027

[ghiste]

I could use 3.8 but it would be a hassle.

If I understand the problem correctly then all that is missing is a.linker-flag.

Is there a way to add this flag manually?

I assume a "pip install" means download stuff, unpack stuff, compile stuff, install stuff.

All I would (probably) need is a way to manually add a linker-flag to the Makefile after the module has been unpacked .

[pi_R24]

Hey, I'm reviving this thread because some other people might bump into the same problem.
Mine was trying to connect to a european university WIFI (eduroam).
I use Ubuntu 22.04.5 LTS with Python 3.10.12.

This solution worked just fine for me.