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lazy imports filter sees the same thing for from x import y and from .x import y #148110
Description
The lazy imports filter gets the unresolved module name for relative imports, so lazy from target import VALUE and lazy from .target import VALUE look identical to the callback even though they resolve to different modules. In this repro both filter calls print ('pkg.runner', 'target', ('VALUE',)), so the filter cannot tell the absolute and relative cases apart.
$ tmpdir=$(mktemp -d)
$ mkdir -p "$tmpdir/pkg"
$ cat > "$tmpdir/target.py" <<'PY'
VALUE = 'absolute'
PY
$ cat > "$tmpdir/pkg/__init__.py" <<'PY'
PY
$ cat > "$tmpdir/pkg/target.py" <<'PY'
VALUE = 'relative'
PY
$ cat > "$tmpdir/pkg/runner.py" <<'PY'
import sys
def my_filter(importer, name, fromlist):
print((importer, name, fromlist))
return True
sys.set_lazy_imports_filter(my_filter)
lazy from target import VALUE as absolute_value
lazy from .target import VALUE as relative_value
PY
$ PYTHONPATH="$tmpdir" ./python -c 'import pkg.runner'
('pkg.runner', 'target', ('VALUE',))
('pkg.runner', 'target', ('VALUE',))
Activity
[-]sys.set_lazy_imports_filter cannot distinguish \ from \[/-][+]lazy imports filter sees the same thing for `from x import y` and `from .x import y`[/+]pythongh-148110: Resolve lazy import filter names for relative imports
pablogsal commentedon Apr 4, 2026
CC @1st1
picnixz commentedon Apr 4, 2026
sys.set_lazy_imports_filterloses information when doing relative imports #148026 as a duplicate of this issuegh-148110: Resolve lazy import filter names for relative imports (#14…
sys.set_lazy_imports_filter(...): Relative imports indistinguishable from absolute imports #145864 as a duplicate of this issuepythongh-148110: Resolve lazy import filter names for relative imports (
pythongh-148110: Resolve lazy import filter names for relative imports (