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Name missing from __all__ on re-import by filmor · Pull Request #2717 · pythonnet/pythonnet · GitHub

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Name missing from __all__ on re-import #2717

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Merged
filmor merged 2 commits into from
May 7, 2026
Conversation 0 Commits 2 Checks 32 Files changed
Merged

Name missing from __all__ on re-import #2717

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71f199e
Adjust test_import to always trigger error-case
filmor May 7, 2026
2ed9daf
Ensure that names are added to __all__ exactly once
filmor May 7, 2026
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26 changes: 14 additions & 12 deletions src/runtime/Types/ModuleObject.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,7 @@ internal class ModuleObject : ExtensionType
internal PyDict dict;
protected string _namespace;
private readonly PyList __all__ = new ();
private readonly HashSet<string> allNames = new();

// Attributes to be set on the module according to PEP302 and 451
// by the import machinery.
Expand Down Expand Up @@ -178,22 +179,23 @@ public void LoadNames()
{
foreach (string name in AssemblyManager.GetNames(_namespace))
{
cache.TryGetValue(name, out var m);
if (m != null)
bool hasValidAttribute = cache.TryGetValue(name, out var m);
if (!hasValidAttribute)
{
continue;
}
BorrowedReference attr = Runtime.PyDict_GetItemString(dict, name);
// If __dict__ has already set a custom property, skip it.
if (!attr.IsNull)
{
continue;
BorrowedReference attr = Runtime.PyDict_GetItemString(dict, name);
// If __dict__ has already set a custom property, skip it.
if (!attr.IsNull)
{
continue;
}

using var attrVal = GetAttribute(name, true);
hasValidAttribute = !attrVal.IsNull();
}

using var attrVal = GetAttribute(name, true);
if (!attrVal.IsNull())
if (hasValidAttribute && allNames.Add(name))
{
// if it's a valid attribute, add it to __all__
// if it's a valid attribute, add it to __all__ once.
using var pyname = Runtime.PyString_FromString(name);
if (Runtime.PyList_Append(__all__, pyname.Borrow()) != 0)
{
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5 changes: 5 additions & 0 deletions tests/test_import.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,11 @@
import pytest
import sys

# Unused import to preload the class
#
# This resulted in the FileStream name missing from the wildcard import later
from System.IO import FileStream # noqa: F401

def test_relative_missing_import():
"""Test that a relative missing import doesn't crash.
Some modules use this to check if a package is installed.
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