• I have marked all applicable categories:
  • exception-raising bug
  • visual output bug
  • documentation request (i.e. "X is missing from the documentation." If instead I want to ask "how to use X?" I understand StackOverflow#tqdm is more appropriate)
  • new feature request
• I have visited the source website, and in particular
  read the known issues
• I have searched through the issue tracker for duplicates
• I have mentioned version numbers, operating system and
  environment, where applicable:

4.48.2 3.8.5 | packaged by conda-forge | (default, Aug 29 2020, 01:18:42)
[Clang 10.0.1 ] darwin

Steps to reproduce:

1. Run a long job in background and disowned, python somejob.py &!. tqdm works fine producing progress bar
2. Exit that shell, the job will die too.
3. However, if running the job with stderr redirtected, python somejob.py 2>/dev/null &!, it will keep running even the shell exited.

I guess when the shell exits, stderr will change/close, tqdm failed to write to that file descriptor as before and raise exception.

What I expected is, tqdm should keep silent if no file to write and never disturb the main job.