Fix/frozen metadata version

mpmath/__init__.py

@@ -1,6 +1,11 @@
-from importlib.metadata import version
+from importlib.metadata import version, PackageNotFoundError
+
+try:
+    __version__ = version(__name__)
+except PackageNotFoundError:
+    # Fallback when metadata unavailable
+    __version__ = "0.0.0"
 
-__version__ = version(__name__)
 del version
 
 import functools

mpmath/tests/test_issue_metadata_fallback.py

@@ -0,0 +1,25 @@
+#!/usr/bin/env python3
+"""Regression test: Simulates frozen app behavior where package metadata is unavailable."""
+import sys
+import importlib.metadata
+import importlib
+
+def test_issue_metadata_fallback(monkeypatch):
+    # Mock metadata.version to simulate frozen app where metadata is unavailable
+    original_version = importlib.metadata.version
+
+    def mock_version(package_name):
+        if package_name == "mpmath":
+            raise importlib.metadata.PackageNotFoundError(
+                f"No package metadata was found for {package_name}"
+            )
+        return original_version(package_name)
+
+    monkeypatch.setattr(importlib.metadata, "version", mock_version)
+
+    # Remove mpmath from sys.modules to force reload
+    sys.modules.pop("mpmath", None)
+
+    # Import mpmath - should fall back to "0.0.0"
+    import mpmath
+    assert mpmath.__version__ == "0.0.0"