pyserial 115200 converts into 115_200

[andreas-amlabs]

Describe the bug A clear and concise description of what the bug is.
When running black --fast nad_transport.py baudrate=115200 converts into baudrate=115_200 which
seems incorrect as 115_200 is not defined by pyserial

To Reproduce Steps to reproduce the behavior:

1. Take this file '...' https://github.com/joopert/nad_receiver/blob/master/nad_receiver/nad_transport.py
2. Run Black on it with these arguments '....' --fast nad_transport.py
3. See error

Expected behavior A clear and concise description of what you expected to happen.

115_200 seems to not be defined by pyserial, so 115200 should not be altered

Environment (please complete the following information):

• Version: [e.g. master]
• OS and Python version: [e.g. Linux/Python 3.7.4rc1]
  Debian, black, version 18.9b0

Does this bug also happen on master? To answer this, you have two options:

1. Use the online formatter at https://black.now.sh/?version=master, which will use the
   latest master branch.
2. Or run Black on your machine:
   • create a new virtualenv (make sure it's the same Python version);
   • clone this repository;
   • run pip install -e .;
   • make sure it's sane by running python -m unittest; and
   • run black like you did last time.

Additional context Add any other context about the problem here.

[ichard26]

Technically 115200 is the same as 115_200:

ichard26@acer-ubuntu:~$ python
Python 3.8.5 (default, Sep  9 2020, 23:45:44) 
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 115_200 == 115200
True

But regardless of language semantics, there are two solutions you have:

1. Pass --skip-numeric-underscore-normalization to Black to tell it to not add underscores to numeric literals
2. Upgrade to a newer version of Black where that behaviour was removed (for reasons you can read in Remove numeric underscore normalization #549) like 19.3b0, 19.10b0, and 20.8b1.

Hope that helps!

[andreas-amlabs]

Thanks for pointing that out, I use Debian buster and I did apt-get installed black (so old version). Closing the issue