Modernize code to Python 3.6+ and some cleanup

11-pythonic-obj/mem_test.py

@@ -8,17 +8,17 @@ if len(sys.argv) == 2:
     module_name = sys.argv[1].replace('.py', '')
     module = importlib.import_module(module_name)
 else:
-    print('Usage: {} <vector-module-to-test>'.format())
+    print(f'Usage: {sys.argv[0]} <vector-module-to-test>')
     sys.exit(1)
 
 fmt = 'Selected Vector2d type: {.__name__}.{.__name__}'
 print(fmt.format(module, module.Vector2d))
 
 mem_init = resource.getrusage(resource.RUSAGE_SELF).ru_maxrss
-print('Creating {:,} Vector2d instances'.format(NUM_VECTORS))
+print(f'Creating {NUM_VECTORS:,} Vector2d instances')
 
 vectors = [module.Vector2d(3.0, 4.0) for i in range(NUM_VECTORS)]
 
 mem_final = resource.getrusage(resource.RUSAGE_SELF).ru_maxrss
-print('Initial RAM usage: {:14,}'.format(mem_init))
-print('  Final RAM usage: {:14,}'.format(mem_final))
+print(f'Initial RAM usage: {mem_init:14,}')
+print(f'  Final RAM usage: {mem_final:14,}')

11-pythonic-obj/private/Expose.java

@@ -18,7 +18,7 @@ public class Expose {
             System.out.println("message.secret = " + wasHidden);
         }
         catch (IllegalAccessException e) { 
-            // this will not happen after setAcessible(true)
+            // this will not happen after setAccessible(true)
             System.err.println(e);
         }   
     }

11-pythonic-obj/private/expose.py

@@ -3,4 +3,4 @@ import Confidential
 message = Confidential('top secret text')
 secret_field = Confidential.getDeclaredField('secret')
 secret_field.setAccessible(True)  # break the lock!
-print 'message.secret =', secret_field.get(message)
+print('message.secret =', secret_field.get(message))

11-pythonic-obj/private/leakprivate.py

@@ -7,5 +7,5 @@ for field in fields:
     # list private fields only
     if Modifier.isPrivate(field.getModifiers()):
         field.setAccessible(True) # break the lock
-        print 'field:', field
-        print '\t', field.getName(), '=', field.get(message)
+        print('field:', field)
+        print('\t', field.getName(), '=', field.get(message))

11-pythonic-obj/private/no_respect.py

@@ -1,4 +1,3 @@
-
 """
 In the Jython registry file there is this line:
 
@@ -14,4 +13,4 @@ message = Confidential('top secret text')
 for name in dir(message):
     attr = getattr(message, name)
     if not callable(attr):  # non-methods only
-        print name + '\t=', attr
+        print(name + '\t=', attr)

11-pythonic-obj/vector2d_v3.py

@@ -81,7 +81,7 @@ Tests of hashing:
     >>> v2 = Vector2d(3.1, 4.2)
     >>> hash(v1), hash(v2)
     (7, 384307168202284039)
-    >>> len(set([v1, v2]))
+    >>> len({v1, v2})
     2
 
 """

11-pythonic-obj/vector2d_v3_prophash.py

@@ -83,7 +83,7 @@ Tests of hashing:
     >>> v2 = Vector2d(3.1, 4.2)
     >>> hash(v1), hash(v2)
     (7, 384307168202284039)
-    >>> len(set([v1, v2]))
+    >>> len({v1, v2})
     2
 
 # end::VECTOR2D_V3_DEMO[]

11-pythonic-obj/vector2d_v3_slots.py

@@ -80,7 +80,7 @@ Tests of hashing:
     >>> v2 = Vector2d(3.1, 4.2)
     >>> hash(v1), hash(v2)
     (7, 384307168202284039)
-    >>> len(set([v1, v2]))
+    >>> len({v1, v2})
     2
 
 # end::VECTOR2D_V3_DEMO[]