commit aa74a53ad61134911ac7904f24fd2630aeaa8ac8
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Fri Dec 13 15:30:41 2019 -0800
committer Brett Cannon <54418+brettcannon@users.noreply.github.com> Fri Dec 13 15:30:41 2019 -0800
tree bb4ae7da7e82182b7e5eec868b1bff47c1c80e3b
parent 3b18b17efcee6f968cf85c543254b3611311e9f4

bpo-36406: Handle namespace packages in doctest (GH-12520) (GH-17591)

(cherry picked from commit 8289e27393395ee903bd096d42e07c112d7f15c6)

Co-authored-by: Xtreak <tir.karthi@gmail.com>

Lib/doctest.py

diff --git a/Lib/doctest.py b/Lib/doctest.py
index bf4889f..dcbcfe5 100644
--- a/Lib/doctest.py
+++ b/Lib/doctest.py
@@ -1059,7 +1059,8 @@
         if module is None:
             filename = None
         else:
-            filename = getattr(module, '__file__', module.__name__)
+            # __file__ can be None for namespace packages.
+            filename = getattr(module, '__file__', None) or module.__name__
             if filename[-4:] == ".pyc":
                 filename = filename[:-1]
         return self._parser.get_doctest(docstring, globs, name,