fix: build a write-only Python property from its setter alone [patch]

[matt-edmondson]

Summary

PythonGenerator.GeneratePropertyDeclaration wrote @name.setter for every writable property. That decorator is an attribute of the property object the @property getter creates, so when a property had no getter the class statement raised NameError: name 'level' is not defined.

A write-only property (CanWrite && !CanRead) is now written as:

def _set_level(self, value: int) -> None:
    record(value)
level = property(fset=_set_level)

Read/write and read-only properties produce the same output as before.

Tests

• New PythonGeneratedSourceImportsTests.WriteOnlyProperty_ImportsAndSets generates a class with HasGetter = false, loads it with python3, sets the property, checks that the setter ran, and checks that reading the property raises AttributeError.
• The new test fails on main with NameError: name 'level' is not defined and passes with this change.
• Full Coder.Test suite: 1072 passed, 0 failed.

Fixes #113

🤖 Generated with Claude Code

https://claude.ai/code/session_017USYdQkEy3VLP48Dd4JadP

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Generated by Claude Code

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud