Issue#2853: Update once_event_filter in events.py

[DeepC004]

Related to #2853

Description:

• Updated once_event_filter in events.py

Check list:

• New tests are added (if a new feature is added)
• New doc strings: description and/or example code are in RST format
• Documentation is updated (if required)

[vfdev-5]

@DeepC004 thanks for the PR, please add unit tests

[DeepC004]

@vfdev-5 thank you for reviewing the PR. I will make the changes as stated above and add unit tests.

[vfdev-5]

Thanks for the updates @DeepC004 !
I left few other comments on how to improve this PR.

[vfdev-5]

LGTM, thanks @DeepC004 !

I started the CI. Once required tests are green we can merge the PR

[vfdev-5]

@DeepC004 there are code formatting issues:

 + flake8 ignite tests examples --config setup.cfg
ignite/engine/events.py:98:121: E501 line too long (129 > 120 characters)
tests/ignite/engine/test_custom_events.py:156:121: E501 line too long (134 > 120 characters)
tests/ignite/engine/test_custom_events.py:159:121: E501 line too long (134 > 120 characters)
tests/ignite/engine/test_custom_events.py:161:1: W293 blank line contains whitespace
tests/ignite/engine/test_custom_events.py:162:121: E501 line too long (134 > 120 characters)
tests/ignite/engine/test_custom_events.py:434:9: F811 redefinition of unused 'assert_once' from line 415
tests/ignite/engine/test_custom_events.py:437:1: W293 blank line contains whitespace
tests/ignite/engine/test_custom_events.py:439:9: F811 redefinition of unused 'assert_' from line 420
tests/ignite/engine/test_custom_events.py:449:5: E303 too many blank lines (2)

Please run the following locally to fix it:

  bash ./tests/run_code_style.sh install
  bash ./tests/run_code_style.sh fmt

However, the following errors should be fixed manually:

tests/ignite/engine/test_custom_events.py:434:9: F811 redefinition of unused 'assert_once' from line 415
tests/ignite/engine/test_custom_events.py:439:9: F811 redefinition of unused 'assert_' from line 420

[vfdev-5]

@DeepC004 please run bash ./tests/run_code_style.sh fmt to fix code formatting issue

[DeepC004]

@DeepC004 please run bash ./tests/run_code_style.sh fmt to fix code formatting issue

I ran the code for formatting the files. The issue is length of some lines is greater than the maximum line length limit. It turns out to be a line for returning the error comment, which I believe can be written in more concise manner.

[vfdev-5]

Let me restart the CI by closing and reopening the PR

[DeepC004]

@vfdev-5 thanks for helping me out throughout the PR. I will remember to consider small details like line length limit and junk whitespaces while contributing. This was my first merged PR, sorry incase I bugged you with doubts and code errors :D

[vfdev-5]

@DeepC004 thanks for your contribution and no worries about code formatting, this can be painful in the beginning ! Hope to see more of your contributions 👍