Tracking variable whereabouts in a plugin

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Assessment

Difficulty
5/5
Estimated time
Over a week
Newbie friendliness
20/100
Issue type
Feature
Clarity
Needs clarification
Activity status
Stale
Tech stack
python
Domain
tooling

Research direction

Start by reviewing the linked loguru-mypy question and the original loguru pull request, then examine how mypy handles the chained opt(...).info(...) calls shown here. The issue does not identify a file, test, or settled implementation approach; done would require an agreed way to track the logger object across those calls and a clearly defined validation case.

Written by the indexing model from the issue text.

Description

question topic-plugins

Please provide more information to help us understand the issue:

  • Type: question
  • Referecenes:
  • Expected behavior: being able to track down variable i.e. from a process it was initialized.
    Code below should illustrate an expected behavior.
  • Actual behavior: n/a
  • mypy version: >=0.770
from luguru import logger

LOG_A = logger.opt(lazy=False)
LOG_B = logger.opt(lazy=True)

LOG_A.info('Test {}', lambda x: x)    # should work
LOG_B.info('Test {}', lambda x: x)    # error

logger.opt(lazy=False).info('Test {c}', c=lambda x: x)  # should work
logger.opt(lazy=True).info('Test {d}', d=lambda x: x)   # error

In short: with loguru you can use Callable[[], Any] for lazy loggers to avoid costly computations. But those have to be non-argument callables. Above you can find non-lazy loggers that will work just fine by doing str(callable). In other words, to rephrase question from above, how can we:

track a variable/object on which behalf a method was called?

This is quite vital because type checking cannot be done solely on a method call level because we need something from another call. There is opt method being called but having call details from it without anything to tie them to will not help too much.

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