- Changed output of DocTestParser.get_program() to make it easier to

visually distinguish the expected output from the comments (use
  "##" to mark expected outputs, and "#" to mark comments).
- If the string given to DocTestParser.get_program() is indented, then
  strip its indentation.  (In particular, find the min indentation of
  non-blank lines, and strip that indentation from all lines.)

Lib/doctest.py

@@ -595,14 +595,20 @@ class DocTestParser:
             print x
             print y
         # Expected:
-        #     2
+        ## 2
-        #     3
+        ## 3
         #
         # Some text.
         x+y
         # Expected:
-        #     5
+        ## 5
         """
+        string = string.expandtabs()
+        # If all lines begin with the same indentation, then strip it.
+        min_indent = self._min_indent(string)
+        if min_indent > 0:
+            string = '\n'.join([l[min_indent:] for l in string.split('\n')])
+
         output = []
         charnum, lineno = 0, 0
         # Find all doctest examples in the string:
@@ -620,7 +626,7 @@ class DocTestParser:
             # Display the expected output, if any
             if want:
                 output.append('# Expected:')
-                output.extend(['#     '+l for l in want.split('\n')])
+                output.extend(['## '+l for l in want.split('\n')])
 
             # Update the line number & char number.
             lineno += string.count('\n', m.start(), m.end())
@@ -702,6 +708,14 @@ class DocTestParser:
                              (lineno, name, source))
         return options
 
+    # This regular expression finds the indentation of every non-blank
+    # line in a string.
+    _INDENT_RE = re.compile('^([ ]+)(?=\S)', re.MULTILINE)
+
+    def _min_indent(self, s):
+        "Return the minimum indentation of any non-blank line in `s`"
+        return min([len(indent) for indent in self._INDENT_RE.findall(s)])
+
     def _comment_line(self, line):
         "Return a commented form of the given line"
         line = line.rstrip()
@@ -2185,15 +2199,15 @@ def script_from_examples(s):
        #
        2 + 2
        # Expected:
-       #     5
+       ## 5
        #
        #     And very friendly error messages:
        #
        1/0
        # Expected:
-       #     To Infinity
+       ## To Infinity
-       #     And
+       ## And
-       #     Beyond
+       ## Beyond
        #
        #     You can use logic if you want:
        #

Lib/test/test_doctest.py

@@ -1057,7 +1057,7 @@ words and expected output are converted to comments:
     #
     print sample_func(22)
     # Expected:
-    #     44
+    ## 44
     #
     # Yee ha!
 
@@ -1065,18 +1065,18 @@ words and expected output are converted to comments:
     >>> print doctest.testsource(test.test_doctest, name)
     print '1\n2\n3'
     # Expected:
-    #     1
+    ## 1
-    #     2
+    ## 2
-    #     3
+    ## 3
 
     >>> name = 'test.test_doctest.SampleClass.a_classmethod'
     >>> print doctest.testsource(test.test_doctest, name)
     print SampleClass.a_classmethod(10)
     # Expected:
-    #     12
+    ## 12
     print SampleClass(0).a_classmethod(10)
     # Expected:
-    #     12
+    ## 12
 """
 
 def test_debug(): r"""