pytest Quick Start Guide

Prefer local imports in conftest files

conftest.py files are imported during collection, so they directly affect your experience when running tests from the command line. For this reason, I suggest using local imports in conftest.py files as often as possible, to keep import times low.

So, don't use this:

import pytestimport tempfilefrom myapp import [e-mail] setup_app():    ...

Prefer local imports:

import [e-mail] setup_app():    import tempfile    from myapp import setup    ...

This practice has a noticeable impact on test startup in large test suites.