Fix issue with [ Language = python ] methods with quoted names

CHANGELOG.md

@@ -5,6 +5,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [4.1.1] - Unreleased
+
+### Fixed
+- #73: No longer errors when a `[ Language = python ]` method has quoted name like "__iter__"
+
 ## [4.1.0] - 2025-11-13
 
 ### Added

cls/TestCoverage/Data/CodeUnit.cls

@@ -405,6 +405,10 @@ Method UpdateSourceMap(pSourceNamespace As %String, ByRef pCache) As %Status
 					// %Foo() becomes _Foo() in the Python code unit.
 					Set tCLSMethodNum = pCLSCodeUnit.MethodMap.GetAt($Replace(tMethod,"_","%"))
 				}
+				If (tCLSMethodNum = "") {
+					// Special Python methods like __iter__ are stored as "__iter__" (with quotes) in CLS
+					Set tCLSMethodNum = pCLSCodeUnit.MethodMap.GetAt(""""_tMethod_"""")
+				}
 				Set tMethodStart = ..MethodMap.GetAt(tMethod)
 				Set tMethodEnd = ..MethodEndMap.GetAt(tMethod)
 				Set tMethodName = tMethod

internal/testing/unit_tests/UnitTest/TestCoverage/Unit/CodeUnit.cls

@@ -164,4 +164,9 @@ ClassMethod PythonWeirdSpacing() [ Language = python ]
 	return [element * 2 for element in x]
 }
 
+Method "__iter__"() [ Language = python ]
+{
+	return self
+}
+
 }