stdout problem example

[Thomas Braunl]

Here is my problem in a nutshell.

Python program calling an external script which prints to stdout:

from subprocess import call

call(["ls", "-l"])

This works fine, if started from a shell, but in Thonny this generates an error message:

>>> %Run randrive.py

Error handling message: Traceback (most recent call last):

  File "/Applications/Thonny.app/Contents/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/thonny/running.py", line 645, in _listen_stdout

    msg = parse_message(data)

  File "/Applications/Thonny.app/Contents/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/thonny/common.py", line 148, in parse_message

    return eval(msg_string.encode("ASCII").decode("UTF-7"))

  File "<string>", line 1

    total 112

            ^

SyntaxError: invalid syntax

Thank you, Thomas

[Aivar Annamaa]

Hi Thomas!

Thonny's backend is supposed to capture all output generated by the programs run by the user. Apparently `subprocess.call` avoids this capture. I created an issue for this and I'll try to resolve it in coming weeks: https://bitbucket.org/plas/thonny/issues/442/output-generated-by-a-subprocess-escapes

best regards,
Aivar