doctest: fix _module_relative_path() error message
Write the module name rather than <module> in the error message, if module has
no __file__ attribute (ex: package).
diff --git a/Lib/doctest.py b/Lib/doctest.py
index 4094723..38fdd80 100644
--- a/Lib/doctest.py
+++ b/Lib/doctest.py
@@ -399,8 +399,9 @@
basedir = os.curdir
else:
# A module w/o __file__ (this includes builtins)
- raise ValueError("Can't resolve paths relative to the module " +
- module + " (it has no __file__)")
+ raise ValueError("Can't resolve paths relative to the module "
+ "%r (it has no __file__)"
+ % module.__name__)
# Combine the base directory and the path.
return os.path.join(basedir, *(path.split('/')))