client hangs

[dkhokhlov]

In [1]: from wolframclient.evaluation import WolframLanguageSession
In [2]: from wolframclient.language import wl, wlexpr
In [3]: session = WolframLanguageSession('/opt/WolframEngine/12.1/Executables/WolframKernel')
In [4]: session.evaluate(wl.WolframAlpha("number of moons of Saturn", "Result"))
<<< hangs here indefinitely

In [5]: session.evaluate(wlexpr('Range[5]'))
<<< hangs here indefinitely

Steps:
Ubuntu 18.04.5 LTS
conda version : 4.8.4
python version : 3.7.7.final.0

1. install development engine
2. activate
3. install client using pip

[DbxDev]

I wonder if that could be the same issue as #17. The problem you're facing is similar and you all are running Ubuntu.

[GSam]

I'm running v12.3 with Python 3.6.9 on Ubuntu.

The following works:
session.evaluate(wlexpr('Range[5]'))

But I can definitely reproduce a hang with:
session.evaluate(wl.WolframAlpha("number of moons of Saturn", "Result"))

Notably the following does return an answer, so there might be a separate issue with the second argument of WolframAlpha:
session.evaluate(wl.WolframAlpha("number of moons of Saturn"))

[GSam]

I'm running v12.3 with Python 3.6.9 on Ubuntu.

The following works:
session.evaluate(wlexpr('Range[5]'))

But I can definitely reproduce a hang with:
session.evaluate(wl.WolframAlpha("number of moons of Saturn", "Result"))

Notably the following does return an answer, so there might be a separate issue with the second argument of WolframAlpha:
session.evaluate(wl.WolframAlpha("number of moons of Saturn"))

Solved one of my hangs:

In[2]:= WolframAlpha["2+2", "Result"]
/usr/local/Wolfram/WolframEngine/12.3/SystemFiles/FrontEnd/Binaries/Linux-x86-64/WolframPlayer: error while loading shared libraries: libasound.so.2: cannot open shared object file: No such file or directory

Solved with:
sudo apt-get install libasound2

I assume that libasound2 should be made an explicit dependency, or an instruction listed.

[DbxDev]

Here is the list of dependencies that the FrontEnd requires. Any FrontEnd dependent function eventually need them:

linux-vdso.so.1
libGL.so.1
libpthread.so.0
librt.so.1
libdl.so.2
libX11.so.6
libfontconfig.so.1
libstdc++.so.6
libm.so.6
libc.so.6
/lib64/ld-linux-x86-64.so.2
libgcc_s.so.1
libuuid.so.1
libz.so.1
libGLX.so.0
libGLdispatch.so.0
libasound.so.2
libxcb.so.1
libexpat.so.1
libXext.so.6
libXau.so.6
libXdmcp.so.6
libbsd.so.0

The command to get these: