[issue37824] IDLE: DeprecationWarning not handled properly

[Serhiy Storchaka]

New submission from Serhiy Storchaka <storchaka+cpython at gmail.com>:

DeprecationWarning at compile time is output multiple times to the stderr (on console from which IDLE was ran), but not to IDLE Shell window.

For example, when enter '\e':

$ ./python -m idlelib

Warning (from warnings module):
  File "<pyshell#0>", line 1
    '\e'
DeprecationWarning: invalid escape sequence \e
>>> 
Warning (from warnings module):
  File "<pyshell#0>", line 1
    '\e'
DeprecationWarning: invalid escape sequence \e
>>> 
Warning (from warnings module):
  File "<pyshell#0>", line 1
    '\e'
DeprecationWarning: invalid escape sequence \e

And when close IDLE, additional output is printed in 3.8+:

>>> Exception ignored in: <idlelib.run.PseudoInputFile object at 0x7f9e3b4a15a0>
Traceback (most recent call last):
  File "/home/serhiy/py/cpython/Lib/idlelib/run.py", line 488, in close
  File "/home/serhiy/py/cpython/Lib/idlelib/pyshell.py", line 1019, in close
  File "/home/serhiy/py/cpython/Lib/idlelib/editor.py", line 1058, in close
  File "/home/serhiy/py/cpython/Lib/idlelib/outwin.py", line 94, in maybesave
  File "/home/serhiy/py/cpython/Lib/idlelib/editor.py", line 991, in get_saved
AttributeError: 'NoneType' object has no attribute 'get_saved'

----------
assignee: terry.reedy
components: IDLE
messages: 349396
nosy: serhiy.storchaka, terry.reedy
priority: normal
severity: normal
status: open
title: IDLE: DeprecationWarning not handled properly
type: behavior
versions: Python 3.7, Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37824>
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