Fix the "Customizing Colors" documentation section

[nicoddemus]

Discussed in #11573

The section https://docs.pytest.org/en/7.4.x/how-to/logging.html#customizing-colors has a broken example. The "broken" means that it can no be copy/pasted to try and there are no explanations about how to use it.

@pytest.hookimpl
def pytest_configure(config):
    logging_plugin = config.pluginmanager.get_plugin("logging-plugin")

    # Change color on existing log level
    logging_plugin.log_cli_handler.formatter.add_color_level(logging.INFO, "cyan")

    # Add color to a custom log level (a custom log level `SPAM` is already set up)
    logging_plugin.log_cli_handler.formatter.add_color_level(logging.SPAM, "blue")

INTERNALERROR> Traceback (most recent call last):
INTERNALERROR>   File "/opt/pysetup/.venv/lib/python3.11/site-packages/_pytest/main.py", line 267, in wrap_session
INTERNALERROR>     config._do_configure()
INTERNALERROR>   File "/opt/pysetup/.venv/lib/python3.11/site-packages/_pytest/config/__init__.py", line 1053, in _do_configure
INTERNALERROR>     self.hook.pytest_configure.call_historic(kwargs=dict(config=self))
INTERNALERROR>   File "/opt/pysetup/.venv/lib/python3.11/site-packages/pluggy/_hooks.py", line 514, in call_historic
INTERNALERROR>     res = self._hookexec(self.name, self._hookimpls, kwargs, False)
INTERNALERROR>           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
INTERNALERROR>   File "/opt/pysetup/.venv/lib/python3.11/site-packages/pluggy/_manager.py", line 115, in _hookexec
INTERNALERROR>     return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
INTERNALERROR>            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
INTERNALERROR>   File "/opt/pysetup/.venv/lib/python3.11/site-packages/pluggy/_callers.py", line 113, in _multicall
INTERNALERROR>     raise exception.with_traceback(exception.__traceback__)
INTERNALERROR>   File "/opt/pysetup/.venv/lib/python3.11/site-packages/pluggy/_callers.py", line 77, in _multicall
INTERNALERROR>     res = hook_impl.function(*args)
INTERNALERROR>           ^^^^^^^^^^^^^^^^^^^^^^^^^
INTERNALERROR>   File "/opt/pysetup/tests/conftest.py", line 49, in pytest_configure
INTERNALERROR>     logging_plugin.log_cli_handler.formatter.add_color_level(logging.INFO, "cyan")
INTERNALERROR>     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
INTERNALERROR> AttributeError: 'NoneType' object has no attribute 'log_cli_handler'

Expected

Add a small working code example or clarify instructions.

[nicoddemus]

I think the example can be fixed simply by using config.pluginmanager.get_plugin("logging").

[aarushis18]

Hi! Is it okay if I work on this? I should be able to submit a PR within the next week.

[nicoddemus]

@aarushis18 sure!

Please also make sure the updated example works.

Also in the future feel free to go ahead and open PRs for unassigned issues like this, no need to ask permission. 👍

[touilleWoman]

Hello, this issue can be closed. Problem solved with PR #11652.
Sorry I mentioned the wrong issue in my PR, I wrote " close #11573" instead of "close #11596".