Convert two tests to work with both Python 2 and 3

Now these two tests work without having to use 2to3

Examples/test-suite/python/python_destructor_exception_runme.py

@@ -1,7 +1,11 @@
 import python_destructor_exception
-from StringIO import StringIO
 import sys
 
+if sys.version_info[0:2] < (3, 0):
+    import StringIO as io
+else:
+    import io
+
 def error_function():
     python_destructor_exception.ClassWithThrowingDestructor().GetBlah()
 
@@ -9,13 +13,13 @@ def runtest():
     attributeErrorOccurred = False
     try:
         error_function()
-    except AttributeError, e:
+    except AttributeError:
         attributeErrorOccurred = True
     return attributeErrorOccurred
 
 def test1():
     stderr_saved = sys.stderr
-    buffer = StringIO()
+    buffer = io.StringIO()
     attributeErrorOccurred = False
     try:
         # Suppress stderr while making this call to suppress the output shown by PyErr_WriteUnraisable

Examples/test-suite/python/python_strict_unicode_runme.py

@@ -1,8 +1,17 @@
 import python_strict_unicode
+import sys
 
 test_bytes   = b"hello \x01world\x99"
 BYTES        = b"BYTES"
-test_unicode = u"h\udce9llo w\u00f6rld"
+
+if sys.version_info[0:2] < (3, 0):
+    test_unicode = u"h\udce9llo w\u00f6rld"
+    UNICODE      = u"UNICODE"
+    type_unicode_string = type(u"")
+else:
+    test_unicode = "h\udce9llo w\u00f6rld"
+    UNICODE      = "UNICODE"
+    type_unicode_string = type("")
 
 # Test that byte string inputs and outputs work as expected
 bdbl = python_strict_unicode.double_str(test_bytes)
@@ -20,12 +29,12 @@ if type(bout) != type(BYTES):
 udbl = python_strict_unicode.double_wstr(test_unicode)
 if udbl != test_unicode + test_unicode:
     raise RuntimeError("Failed to double wide string")
-if type(udbl) != type(u""):
+if type(udbl) != type_unicode_string:
     raise RuntimeError("Wrong type output for wide string")
 uout = python_strict_unicode.same_wstr(test_unicode)
 if uout != test_unicode:
     raise RuntimeError("Failed to copy wchar_t*")
-if type(uout) != type(u""):
+if type(uout) != type_unicode_string:
     raise RuntimeError("Wrong type output for wchar_t*")
 
 # Test that overloading is handled properly
@@ -35,9 +44,9 @@ if bovr != BYTES:
 if type(bovr) != type(BYTES):
     raise RuntimeError("Wrong type output from overload")
 uovr = python_strict_unicode.overload(test_unicode)
-if uovr != u"UNICODE":
+if uovr != UNICODE:
     raise RuntimeError("Failed to return unicode from overload")
-if type(uovr) != type(u""):
+if type(uovr) != type_unicode_string:
     raise RuntimeERror("Wrong type output from overload")
 
 # Test that bytes aren't accepted as wide strings and unicode isn't accepted as narrow strings