Jurjen N.E. Bos added the comment:

I am not as good in making nice patches, but that code can be improved upon a 
bit as follows:
<insert patch intro blurb here, same as original>

+        if isinstance(obj, str) and source_lines is not None:
+            # This will find __test__ string doctests if and only if the string
+            # contains any unique line.
+            for offset,line in enumerate(obj.splitlines(keepends=True):
+                if source_lines.count(line)==1:
+                    lineno = source_lines.index(line)-offset
+                    break

         # We couldn't find the line number.
         return None


I thing this will improve legibility and probably also speed under most 
circumstances.

----------
nosy: +jneb

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