+ Added Linear Congruential Generator PRNG function to generate a

   unique ID per object. This allows us to implement an id() function
   that returns a unique id, and create more realistic-looking repr()
   strings.
 + Implemented id()

pyjaco/stdlib/05-init.js

@@ -26,10 +26,17 @@
 
 var $PY = {};
 
+$PY.prng = 42;
+
 var __builtins__ = {};
 
 __builtins__.PY$__python3__ = false;
 
+function prng() {
+    $PY.prng = ($PY.prng * 0x8088405 + 1) % 0xFFFFFFFF;
+    return $PY.prng;
+}
+
 function bt() {
     try {
         null();

pyjaco/stdlib/10-builtin.js

@@ -193,7 +193,10 @@ __builtins__.PY$hex = function(num) {
     }
 };
 
-__builtins__.PY$id = $PY.c_nif;
+__builtins__.PY$id = function(obj) {
+    return __builtins__.PY$int(obj.id);
+}
+
 __builtins__.PY$input = $PY.c_nif;
 
 __builtins__.PY$intern = function(x) {

pyjaco/stdlib/11-classes.js

@@ -82,6 +82,7 @@ object.PY$__create__ = function(cls) {
     };
 
     obj.PY$__class__ = cls;
+    obj.id = prng();
     obj.PY$__init__.apply(obj, args);
     return obj;
 };
@@ -121,7 +122,7 @@ object.PY$__delattr__ = function(k) {
 
 object.PY$__repr__ = function() {
     if (this.PY$__class__) {
-        return str("<instance of " + this.PY$__class__.PY$__name__ + " at 0xPYJACO>");
+        return str("<instance of " + this.PY$__class__.PY$__name__ + " at 0x" + this.id.toString(16) + ">");
     } else if (this.PY$__name__) {
         return str("<type '" + this.PY$__name__ + "'>");
     } else {