Get doctest to pass. The problem was int/int -> float now. There

were some cases where an int was assumed.

Also had to change the string of the exception when dividing and int by zero.
Not sure what the best error message should be.  Currently
  5 / 0 yields the message: ZeroDivisionError: float division

That isn't entirely correct.  But I'm not sure what else to do.

Lib/test/test_doctest.py

@@ -605,7 +605,7 @@ DocTestFinder finds the line number of each example:
     ...     ...     print x,
     ...     0 1 2 3 4 5 6 7 8 9
     ...     >>> x/2
-    ...     6
+    ...     6.0
     ...     '''
     >>> test = doctest.DocTestFinder().find(f)[0]
     >>> [e.lineno for e in test.examples]
@@ -680,7 +680,7 @@ statistics.  Here's a simple DocTest case we can use:
     ...     >>> print x
     ...     12
     ...     >>> x/2
-    ...     6
+    ...     6.0
     ...     '''
     >>> test = doctest.DocTestFinder().find(f)[0]
 
@@ -701,7 +701,7 @@ the failure and proceeds to the next example:
     ...     >>> print x
     ...     14
     ...     >>> x/2
-    ...     6
+    ...     6.0
     ...     '''
     >>> test = doctest.DocTestFinder().find(f)[0]
     >>> doctest.DocTestRunner(verbose=True).run(test)
@@ -725,7 +725,7 @@ the failure and proceeds to the next example:
     Trying:
         x/2
     Expecting:
-        6
+        6.0
     ok
     (1, 3)
 """
@@ -739,7 +739,7 @@ output:
     ...     >>> print x
     ...     12
     ...     >>> x/2
-    ...     6
+    ...     6.0
     ...     '''
     >>> test = doctest.DocTestFinder().find(f)[0]
 
@@ -756,7 +756,7 @@ output:
     Trying:
         x/2
     Expecting:
-        6
+        6.0
     ok
     (0, 3)
 
@@ -786,7 +786,7 @@ iff `-v` appears in sys.argv:
     Trying:
         x/2
     Expecting:
-        6
+        6.0
     ok
     (0, 3)
 
@@ -808,7 +808,7 @@ replaced with any other string:
     ...     >>> x = 12
     ...     >>> print x/0
     ...     Traceback (most recent call last):
-    ...     ZeroDivisionError: integer division or modulo by zero
+    ...     ZeroDivisionError: float division
     ...     '''
     >>> test = doctest.DocTestFinder().find(f)[0]
     >>> doctest.DocTestRunner(verbose=False).run(test)
@@ -825,7 +825,7 @@ unexpected exception:
     ...     >>> print 'pre-exception output', x/0
     ...     pre-exception output
     ...     Traceback (most recent call last):
-    ...     ZeroDivisionError: integer division or modulo by zero
+    ...     ZeroDivisionError: float division
     ...     '''
     >>> test = doctest.DocTestFinder().find(f)[0]
     >>> doctest.DocTestRunner(verbose=False).run(test)
@@ -836,7 +836,7 @@ unexpected exception:
         print 'pre-exception output', x/0
     Exception raised:
         ...
-        ZeroDivisionError: integer division or modulo by zero
+        ZeroDivisionError: float division
     (1, 2)
 
 Exception messages may contain newlines:
@@ -933,7 +933,7 @@ unexpected exception:
     Exception raised:
         Traceback (most recent call last):
         ...
-        ZeroDivisionError: integer division or modulo by zero
+        ZeroDivisionError: float division
     (1, 1)
 """
     def optionflags(): r"""