exclude_empty: make the default True for DocTestFinder, and introduce it

with default False for testmod().  The real point of introducing this was
so that output from doctest.master.summarize() would be the same as in
2.3, and doctest.master in 2.4 is a backward-compatability hack used only
by testmod().

Lib/doctest.py

@@ -848,8 +848,7 @@ class DocTestFinder:
     """
 
     def __init__(self, verbose=False, parser=DocTestParser(),
-                 recurse=True, _namefilter=None,
-                 exclude_empty=False):
+                 recurse=True, _namefilter=None, exclude_empty=True):
         """
         Create a new doctest finder.
 
@@ -862,8 +861,8 @@ class DocTestFinder:
         If the optional argument `recurse` is false, then `find` will
         only examine the given object, and not any contained objects.
 
-        If the optional argument `exclude_empty` is true, then `find`
-        will exclude tests for objects with empty docstrings.
+        If the optional argument `exclude_empty` is false, then `find`
+        will include tests for objects with empty docstrings.
         """
         self._parser = parser
         self._verbose = verbose
@@ -1836,9 +1835,10 @@ master = None
 
 def testmod(m=None, name=None, globs=None, verbose=None, isprivate=None,
             report=True, optionflags=0, extraglobs=None,
-            raise_on_error=False):
+            raise_on_error=False, exclude_empty=False):
     """m=None, name=None, globs=None, verbose=None, isprivate=None,
-       report=True, optionflags=0, extraglobs=None
+       report=True, optionflags=0, extraglobs=None, raise_on_error=False,
+       exclude_empty=False
 
     Test examples in docstrings in functions and classes reachable
     from module m (or the current module if m is not supplied), starting
@@ -1930,7 +1930,7 @@ def testmod(m=None, name=None, globs=None, verbose=None, isprivate=None,
         name = m.__name__
 
     # Find, parse, and run all tests in the given module.
-    finder = DocTestFinder(_namefilter=isprivate)
+    finder = DocTestFinder(_namefilter=isprivate, exclude_empty=exclude_empty)
 
     if raise_on_error:
         runner = DebugRunner(verbose=verbose, optionflags=optionflags)

Lib/test/test_doctest.py

@@ -377,8 +377,8 @@ By default, tests are created for objects with no docstring:
 
     >>> def no_docstring(v):
     ...     pass
-    >>> finder.find(no_docstring) # doctest: +ELLIPSIS
-    [<DocTest no_docstring from ... (no examples)>]
+    >>> finder.find(no_docstring)
+    []
 
 However, the optional argument `exclude_empty` to the DocTestFinder
 constructor can be used to exclude tests for objects with empty
@@ -414,8 +414,6 @@ methods, classmethods, staticmethods, properties, and nested classes.
      1  SampleClass
      3  SampleClass.NestedClass
      1  SampleClass.NestedClass.__init__
-     0  SampleClass.NestedClass.get
-     0  SampleClass.NestedClass.square
      1  SampleClass.__init__
      2  SampleClass.a_classmethod
      1  SampleClass.a_property
@@ -473,8 +471,6 @@ functions, classes, and the `__test__` dictionary, if it exists:
      1  some_module.SampleClass
      3  some_module.SampleClass.NestedClass
      1  some_module.SampleClass.NestedClass.__init__
-     0  some_module.SampleClass.NestedClass.get
-     0  some_module.SampleClass.NestedClass.square
      1  some_module.SampleClass.__init__
      2  some_module.SampleClass.a_classmethod
      1  some_module.SampleClass.a_property
@@ -516,6 +512,23 @@ deprecated isprivate gimmick.
     >>> tests = doctest.DocTestFinder(_namefilter=namefilter).find(SampleClass)
     >>> tests.sort()
     >>> for t in tests:
+    ...     print '%2s  %s' % (len(t.examples), t.name)
+     1  SampleClass
+     3  SampleClass.NestedClass
+     1  SampleClass.NestedClass.__init__
+     1  SampleClass.__init__
+     1  SampleClass.double
+     1  SampleClass.get
+
+By default, that excluded objects with no doctests.  exclude_empty=False
+tells it to include (empty) tests for objects with no doctests.  This feature
+is really to support backward compatibility in what doctest.master.summarize()
+displays.
+
+    >>> tests = doctest.DocTestFinder(_namefilter=namefilter,
+    ...                                exclude_empty=False).find(SampleClass)
+    >>> tests.sort()
+    >>> for t in tests:
     ...     print '%2s  %s' % (len(t.examples), t.name)
      1  SampleClass
      3  SampleClass.NestedClass
@@ -550,7 +563,7 @@ object explicitly passed to DocTestFinder:
     ...     return base == 'SampleClass'
     >>> tests = doctest.DocTestFinder(_namefilter=namefilter).find(SampleClass)
     >>> len(tests)
-    11
+    9
 
 Turning off Recursion
 ~~~~~~~~~~~~~~~~~~~~~