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I'm using warnings.warn(), together with a print, but the warnings are not returned:

if[1!=2]:
    print('Error')
    warnings.warn('Warning!')
#returns:  Error

I'm using Jupyter. Would appreciate if someone could assist

Sos
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  • Are you also looking at your error output? (stderr). `warnings.warn` probably writes there while print writes on stdout – smagnan Oct 24 '19 at 13:59
  • It prints it out in my console. Look here: https://stackoverflow.com/questions/9031783/hide-all-warnings-in-ipython#9031848 maybe there's something in your jupyter startup files – gstukelj Oct 24 '19 at 14:00
  • Works fine for me. Cannot reproduce the issue. See these posts, maybe there is something related to your issue: [Configure IPython to show warnings all the time](https://stackoverflow.com/q/27787677/7851470), [Jupyter notebook does not print logs to the output cell](https://stackoverflow.com/q/35936086/7851470) – Georgy Oct 24 '19 at 14:03
  • Also: https://stackoverflow.com/a/37979724/3465514 and https://stackoverflow.com/a/40667761/3465514: two good comments that explain how warning display is handled, it might have been called already and the following calls are muted – smagnan Oct 24 '19 at 14:06
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    Thanks a lot guys. This was working fine a bit ago, suddenly it stopped working. @gst : terminal shows nothing there when running this jupyter cell. Thanks to your links, I solved it with `warnings.filterwarnings('always')`. I guess I will need to include it in my preamble. Also, I've voted to close since [https://stackoverflow.com/questions/27787677/configure-ipython-to-show-warnings-all-the-time](this) was the same question (and solution) – Sos Oct 24 '19 at 14:12
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    Possible duplicate of [Configure IPython to show warnings all the time](https://stackoverflow.com/questions/27787677/configure-ipython-to-show-warnings-all-the-time) – Sos Oct 24 '19 at 14:12

1 Answers1

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I was having the same issue. My solution was to switch to python's logging package.

import logging
logging.warning("Warning!")

It printed to the console on my end!

Danny Denenberg
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