bpo-46306: simplify CodeType attribute access in doctest.py (GH-30481)

sobolevn · kumaraditya303 · web-flow · commit 0fc58c1e0510 · 2022-01-08T15:13:42.000-05:00
Assume co_firstlineno always exists on types.CodeType objects.

Co-authored-by: Kumar Aditya &lt;59607654+kumaraditya303@users.noreply.github.com&gt;
diff --git a/Lib/doctest.py b/Lib/doctest.py
@@ -1113,7 +1113,7 @@ def _find_lineno(self, obj, source_lines):
         if inspect.istraceback(obj): obj = obj.tb_frame
         if inspect.isframe(obj): obj = obj.f_code
         if inspect.iscode(obj):
-            lineno = getattr(obj, 'co_firstlineno', None)-1
+            lineno = obj.co_firstlineno - 1
 
         # Find the line number where the docstring starts.  Assume
         # that it's the first line that begins with a quote mark.
diff --git a/Misc/NEWS.d/next/Library/2022-01-08-13-53-25.bpo-46306.1_es8z.rst b/Misc/NEWS.d/next/Library/2022-01-08-13-53-25.bpo-46306.1_es8z.rst
@@ -0,0 +1,2 @@
+Assume that :class:`types.CodeType` always has :attr:`types.CodeType.co_firstlineno` in
+:mod:`doctest`.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	+Assume that :class:`types.CodeType` always has :attr:`types.CodeType.co_firstlineno` in
	`2`	+:mod:`doctest`.