Python output raises NameError on import for any parameter or return typed `long` (emitted as the undefined name `long`)

[matt-edmondson]

What's wrong

PythonGenerator.PythonTypeName (Coder/Languages/PythonGenerator.cs ~line 695) maps only int, string, bool, float, double and void. Every other type name is written through unchanged. The C, C++, Go and Rust type maps all translate long (to long long, int64 and i64), and C# accepts long natively. Python has no long. Parameter and return annotations are evaluated when the def runs, and no from __future__ import annotations is emitted, so the generated module fails as soon as it is imported.

This is distinct from #102, which covers annotations naming a class that is declared later.

Repro

var f = new FunctionDeclaration("total") { ReturnType = "long" };
f.Parameters.Add(new Parameter("count", "long"));
f.Body.Add(new ReturnStatement(new VariableReference("count")));
var file = new SourceFile("m"); file.Members.Add(f);
Console.WriteLine(new PythonGenerator().Generate(file));

• Actual: def total(count: long) -> long:. python3 -c "import m" fails with NameError: name 'long' is not defined.
• Expected: def total(count: int) -> int:.

Suggested fix

Add "long" => "int" to PythonTypeName. It is worth checking the other numeric names the other generators map (e.g. short, byte, decimal) at the same time. Add a case to PythonGeneratedSourceImportsTests that imports a module using long.

[matt-edmondson]

Triage

• Category: Bug
• Priority: Medium. The generated module fails on import with NameError, so it is loud, and the fix is a one-line mapping.
• Area / suggested owner: PythonGenerator.PythonTypeName (~695)
• Duplicates / in progress: Not a duplicate of Python output raises NameError on import when a method or field annotation names its own class (or a class declared later in the file) #102 (forward-referenced class annotations), though both are Python annotation-evaluation failures. No open PR references it.
• Notes: Worth auditing short, byte, decimal, uint, ulong and char against the other generators' type maps in the same PR.

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