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optimize getting of line number in pytest discovery #26017

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optimize getting of line number in pytest discovery #26017

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7e2d97e
try getting pytest case lineno by internal API to avoid unnecessary e…
vaclavHala Jun 22, 2026
0923fbf
guard agains changes in _pytest internals
vaclavHala Jul 6, 2026
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24 changes: 23 additions & 1 deletion python_files/vscode_pytest/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,12 @@

import pytest

PYTEST_INTERNAL_AVAILABLE = False
with contextlib.suppress(ImportError):
from _pytest.python import PyobjMixin
from _pytest._code.code import Code
PYTEST_INTERNAL_AVAILABLE = True

if TYPE_CHECKING:
from pluggy import Result
from typing_extensions import NotRequired
Expand Down Expand Up @@ -842,8 +848,23 @@ def create_test_node(
Keyword arguments:
test_case -- the pytest test case.
"""

lineno0 = None
if PYTEST_INTERNAL_AVAILABLE:
try:
# test_case.location returns tuple of path and line number
# Obtaining the path is expensive and we do not need it anyway.
# Before falling back to that high-level API, we try to use
# internal API to get just line number without the path.
lineno0 = Code.from_function(cast(PyobjMixin, test_case).obj).firstlineno # type: ignore
except Exception:
pass

if lineno0 is None:
lineno0 = test_case.location[1]

test_case_loc: str = (
str(test_case.location[1] + 1) if (test_case.location[1] is not None) else ""
str(lineno0 + 1) if (lineno0 is not None) else ""
)
absolute_test_id = get_absolute_test_id(test_case.nodeid, get_node_path(test_case))
return {
Expand Down Expand Up @@ -1261,3 +1282,4 @@ def pytest_plugin_registered(plugin: object, manager: pytest.PytestPluginManager
and not manager.hasplugin(plugin_name)
):
manager.register(DeferPlugin(), name=plugin_name)