Fixing Item 21 examples for Python 2.

Must have floating point numerators to make the function work.
The error messages for Python 2 should be generated in a Python 2 example.

Author: bslatkin

example_code/item_21.py

@@ -108,47 +108,3 @@ def safe_division_c(number, divisor, *,
     assert False
 except ZeroDivisionError:
     pass  # Expected
-
-
-# Example 12
-# This and what's below isn't actually Python 2! But I'm trying to
-# make it seem like it is a continuation of the Python 2 code above.
-def safe_division_d(number, divisor, **kwargs):
-    ignore_overflow = kwargs.pop('ignore_overflow', False)
-    ignore_zero_div = kwargs.pop('ignore_zero_division', False)
-    if kwargs:
-        raise TypeError('Unexpected **kwargs: %r' % kwargs)
-    try:
-        return number / divisor
-    except OverflowError:
-        if ignore_overflow:
-            return 0
-        else:
-            raise
-    except ZeroDivisionError:
-        if ignore_zero_div:
-            return float('inf')
-        else:
-            raise
-
-safe_division_d(1, 10)
-safe_division_d(1, 0, ignore_zero_division=True)
-safe_division_d(1, 10**500, ignore_overflow=True)
-
-
-# Example 13
-try:
-    safe_division_d(1, 0, False, True)
-except:
-    logging.exception('Expected')
-else:
-    assert False
-
-
-# Example 14
-try:
-    safe_division_d(0, 0, unexpected=True)
-except:
-    logging.exception('Expected')
-else:
-    assert False

example_code/item_21_example_11.py

@@ -39,6 +39,23 @@ def safe_division_d(number, divisor, **kwargs):
         else:
             raise
 
-safe_division_d(1, 10)
-safe_division_d(1, 0, ignore_zero_division=True)
-safe_division_d(1, 10**500, ignore_overflow=True)
+assert safe_division_d(1.0, 10.0) == 0.1
+assert safe_division_d(1.0, 0.0, ignore_zero_division=True) == float('inf')
+assert safe_division_d(1.0, 10**500, ignore_overflow=True) == 0.0
+
+# Example 12
+try:
+    safe_division_d(1.0, 0, False, True)
+except:
+    logging.exception('Expected')
+else:
+    assert False
+
+
+# Example 13
+try:
+    safe_division_d(0.0, 0, unexpected=True)
+except:
+    logging.exception('Expected')
+else:
+    assert False