TLDR: With the commit for SERVER-23312 we have enabled Python formatting (via yapf) and linting for all .py files under buildscripts & pytests. We have also updated the linters.

If you do not create/modify Python files, there should be no impact for you. If you use scons lint, you will need to ensure that your Python environment has the latest linters. You can update the Python linters using the following commands:
pip2 install -r pytests/requirements.txt
pip2 install -r buildscripts/requirements.txt
pip3 install -r buildscripts/requirements.txt

If you create/modify any Python files under these directories, you will need to format & lint them before you commit. You can directly format & lint using the following commands(this will format  & lint all files):
python buildscripts/pylinters.py fix
python buildscripts/pylinters.py lint

There are other options you can choose to use:

python2 buildscripts/pylinters.py --help
usage: pylinters.py [-h] [--yapf LINTER_YAPF] [--pylint LINTER_PYLINT]
                    [--pydocstyle LINTER_PYDOCSTYLE] [--mypy LINTER_MYPY]
                    [--linters LINTERS] [-v]
                    {lint,lint-all,lint-patch,fix} ...

PyLinter frontend.

optional arguments:
  -h, --help            show this help message and exit
  --yapf LINTER_YAPF    Path to linter yapf
  --pylint LINTER_PYLINT
                        Path to linter pylint
  --pydocstyle LINTER_PYDOCSTYLE
                        Path to linter pydocstyle
  --mypy LINTER_MYPY    Path to linter mypy
  --linters LINTERS     Comma separated list of filters to use, defaults to
                        'all'
  -v, --verbose         Enable verbose logging

Linter subcommands:
  {lint,lint-all,lint-patch,fix}
                        sub-command help
    lint                Lint only Git files
    lint-all            Lint All files
    lint-patch          Lint the files in a patch
    fix                 Fix files if possible