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Fix "SyntaxErr: 'yield' inside async ..." importing wolframclient in Idle?

I followed the install directions as carefully I could from the web page Wolfram Client Library forPython but got a syntax error several levels deep in the client library. What might be wrong?

Here is the output from the Python shell under Raspbian on a Pi 3:

thon 3.5.3 (default, Sep 27 2018, 17:25:39) 
[GCC 6.3.0 20170516] on linux
Type "copyright", "credits" or "license()" for more information.
>>> from wolframclient.evaluation import WolframLanguageSession
Traceback (most recent call last):
  File "<pyshell#0>", line 1, in <module>
    from wolframclient.evaluation import WolframLanguageSession
  File "/usr/local/lib/python3.5/dist-packages/wolframclient/evaluation/__init__.py", line 5, in <module>
    from wolframclient.evaluation.cloud import (
  File "/usr/local/lib/python3.5/dist-packages/wolframclient/evaluation/cloud/__init__.py", line 5, in <module>
    from wolframclient.evaluation.cloud.cloudsession import WolframAPICall, WolframCloudSession
  File "/usr/local/lib/python3.5/dist-packages/wolframclient/evaluation/cloud/cloudsession.py", line 14, in <module>
    from wolframclient.evaluation.result import (
  File "/usr/local/lib/python3.5/dist-packages/wolframclient/evaluation/result.py", line 373
    yield msg
    ^
SyntaxError: 'yield' inside async function
>>>

Here is the console log from installing wolframclient:

pi@raspberrypi:~ $ sudo pip3 install wolframclient
Collecting wolframclient
  Downloading https://files.pythonhosted.org/packages/2e/01/0d51ce2b1e766acfa17355cc99c7cab2190783542c8ed085260f7c19d8a5/wolframclient-1.0.2-py2.py3-none-any.whl (827kB)
    100% |????????????????????????????????| 829kB 321kB/s 
Requirement already satisfied: pip in /usr/lib/python3/dist-packages (from wolframclient)
Requirement already satisfied: numpy in /usr/lib/python3/dist-packages (from wolframclient)
Requirement already satisfied: oauthlib in /usr/lib/python3/dist-packages (from wolframclient)
Collecting pytz (from wolframclient)
  Downloading https://files.pythonhosted.org/packages/3d/73/fe30c2daaaa0713420d0382b16fbb761409f532c56bdcc514bf7b6262bb6/pytz-2019.1-py2.py3-none-any.whl (510kB)
    100% |????????????????????????????????| 512kB 517kB/s 
Collecting zmq (from wolframclient)
  Downloading https://www.piwheels.org/simple/zmq/zmq-0.0.0-py3-none-any.whl
Collecting aiohttp (from wolframclient)
  Downloading https://www.piwheels.org/simple/aiohttp/aiohttp-3.5.4-cp35-cp35m-linux_armv7l.whl (1.1MB)
    100% |????????????????????????????????| 1.1MB 242kB/s 
Requirement already satisfied: requests in /usr/lib/python3/dist-packages (from wolframclient)
Collecting pyzmq (from zmq->wolframclient)
  Downloading https://files.pythonhosted.org/packages/f8/48/5416696b9f2eacc7d1f9fe3a7187ad54d769e09585ec0b59c137ab5c7575/pyzmq-18.0.1.tar.gz (1.2MB)
    100% |????????????????????????????????| 1.2MB 208kB/s 
Collecting async-timeout<4.0,>=3.0 (from aiohttp->wolframclient)
  Downloading https://files.pythonhosted.org/packages/e1/1e/5a4441be21b0726c4464f3f23c8b19628372f606755a9d2e46c187e65ec4/async_timeout-3.0.1-py3-none-any.whl
Collecting typing-extensions>=3.6.5; python_version < "3.7" (from aiohttp->wolframclient)
  Downloading https://files.pythonhosted.org/packages/0f/62/c66e553258c37c33f9939abb2dd8d2481803d860ff68e635466f12aa7efa/typing_extensions-3.7.2-py3-none-any.whl
Collecting yarl<2.0,>=1.0 (from aiohttp->wolframclient)
  Downloading https://www.piwheels.org/simple/yarl/yarl-1.3.0-cp35-cp35m-linux_armv7l.whl (227kB)
    100% |????????????????????????????????| 235kB 485kB/s 
Requirement already satisfied: chardet<4.0,>=2.0 in /usr/lib/python3/dist-packages (from aiohttp->wolframclient)
Collecting idna-ssl>=1.0; python_version < "3.7" (from aiohttp->wolframclient)
  Downloading https://www.piwheels.org/simple/idna-ssl/idna_ssl-1.1.0-py3-none-any.whl
Collecting multidict<5.0,>=4.0 (from aiohttp->wolframclient)
  Downloading https://www.piwheels.org/simple/multidict/multidict-4.5.2-cp35-cp35m-linux_armv7l.whl (301kB)
    100% |????????????????????????????????| 307kB 540kB/s 
Collecting attrs>=17.3.0 (from aiohttp->wolframclient)
  Downloading https://files.pythonhosted.org/packages/23/96/d828354fa2dbdf216eaa7b7de0db692f12c234f7ef888cc14980ef40d1d2/attrs-19.1.0-py2.py3-none-any.whl
Requirement already satisfied: idna>=2.0 in /usr/lib/python3/dist-packages (from yarl<2.0,>=1.0->aiohttp->wolframclient)
Building wheels for collected packages: pyzmq
  Running setup.py bdist_wheel for pyzmq ... done
  Stored in directory: /root/.cache/pip/wheels/45/76/9a/c8323139cd1d805c76f8cae94408675fc06b911ebf626b8753
Successfully built pyzmq
Installing collected packages: pytz, pyzmq, zmq, async-timeout, typing-extensions, multidict, yarl, idna-ssl, attrs, aiohttp, wolframclient
Successfully installed aiohttp-3.5.4 async-timeout-3.0.1 attrs-19.1.0 idna-ssl-1.1.0 multidict-4.5.2 pytz-2019.1 pyzmq-18.0.1 typing-extensions-3.7.2 wolframclient-1.0.2 yarl-1.3.0 zmq-0.0.0
pi@raspberrypi:~ $

This is the Raspbian version information:

pi@raspberrypi:~ $ cat /etc/os-release
PRETTY_NAME="Raspbian GNU/Linux 9 (stretch)"
NAME="Raspbian GNU/Linux"
VERSION_ID="9"
VERSION="9 (stretch)"
ID=raspbian
ID_LIKE=debian
HOME_URL="http://www.raspbian.org/"
SUPPORT_URL="http://www.raspbian.org/RaspbianForums"
BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"
pi@raspberrypi:~ $ uname -a
Linux raspberrypi 4.14.79-v7+ #1159 SMP Sun Nov 4 17:50:20 GMT 2018 armv7l GNU/Linux
pi@raspberrypi:~ $
POSTED BY: Rich Gabrielson
13 Replies
Sort By:
Seth N
Seth N
Posted 6 years ago
POSTED BY: Seth N

In terms of platform support, I would expect the product to run on most x86 Linux distributions and Raspbian on the Raspberry Pi (where it is available as a deb package), not on any other ARM devices for now.
POSTED BY: Ilian Gachevski
Seth N
Seth N
Posted 6 years ago

Hello Mr. IIian,

Seth here. So, on a Linux Distro w/ a small, embedded SiP computer, would I just install the Python version w/out the Engine to make this "export" work?

Seth

P.S. I have been trying to make it work but w/out any luck so far.
POSTED BY: Seth N

I think the problem is that it is looking for the default installation location on general Linux systems, which is somewhere under /usr/local/Wolfram, but is different on the Raspberry Pi.

The appropriate path can be specified manually, e.g. by setting an environment variable like

export WOLFRAM_INSTALLATION_DIRECTORY=/opt/Wolfram/WolframEngine/12.0
POSTED BY: Ilian Gachevski

OK, adding export WOLFRAM_INSTALLATION_DIRECTORY=/opt/Wolfram/WolframEngine/11.3 to the end of /etc/profile did the trick. Thanks, Ilian!
POSTED BY: Rich Gabrielson

Indeed, Python 3.6 accepts the yield statement that 3.5 chokes on. However, in the constructor for WolframLanguageSession this error occurs:

Python 3.6.8 (default, May 27 2019, 11:48:37) 
[GCC 6.3.0 20170516] on linux
Type "help", "copyright", "credits" or "license()" for more information.
>>> from wolframclient.evaluation import WolframLanguageSession
>>> from wolframclient.language import wl, wlexpr
>>> session = WolframLanguageSession()
Traceback (most recent call last):
  File "<pyshell#3>", line 1, in <module>
    session = WolframLanguageSession()
  File "/usr/local/lib/python3.6/site-packages/wolframclient/evaluation/kernel/localsession.py", line 121, in __init__
    **kwargs)
  File "/usr/local/lib/python3.6/site-packages/wolframclient/evaluation/kernel/kernelcontroller.py", line 132, in __init__
    'Invalid kernel value. Expecting a filepath as a string.')
ValueError: Invalid kernel value. Expecting a filepath as a string.
>>>

The error occurs because the function find_default_kernel_path() returns nothing. I used make altinstall as the final step in building the client, to install it in /usr/local/lib -- could that be the problem?
POSTED BY: Rich Gabrielson
POSTED BY: Ilian Gachevski
Seth N
Seth N
Posted 6 years ago

Hello Sir,

Thank you for this clarification. Now, I understand. Maybe it is time to update the GitHub and Wiki?

Seth

P.S. Anyway, now I know. Python 3.6 is needed I guess. Off to check it out. Will the Wolfram language work on any Debian Distro (Stretch) or do I have to have Raspbian? I am asking b/c I could not seem to make it
POSTED BY: Seth N
Seth N
Seth N
Posted 6 years ago

Hello Sir,

Thank you for this clarification. Now, I understand. Maybe it is time to update the GitHub and Wiki?

Seth

P.S. Anyway, now I know. Python 3.6 is needed I guess. Off to check it out. Hey sir, can I use the Wolfram Language on any Debian Distro or do I have to have the Raspbian OS?
POSTED BY: Seth N
Seth N
Seth N
Posted 6 years ago

Hello Sir,

Thank you for this clarification. Now, I understand. Maybe it is time to update the GitHub and Wiki?

Seth

P.S. Anyway, now I know. Python 3.6 is needed I guess. Off to check it out. Hey sir, can I use the Wolfram Language on any Debian Distro or do I have to have the Raspbian OS?
POSTED BY: Seth N
Seth N
Seth N
Posted 6 years ago
POSTED BY: Seth N
Seth N
Seth N
Posted 6 years ago
POSTED BY: Seth N

Thanks, Seth.

It's not apparent that the syntax error results from any dependency on the cloud or desktop. Raspbian comes with the Wolfram engine and the "Mathematica" IDE -- is the "desktop" something different?

I looked at the code: the syntax error is in the class WolframCloudEvaluationResponseAsync, which is not explicitly imported by cloudsession.py. (It's apparently a derived class from WolframCloudEvaluationResponseAsync FWIW.) Above my pay grade!
POSTED BY: Rich Gabrielson
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