Start på pass 2

Pass2/OOP with constructor.py

@@ -0,0 +1,28 @@
+class MyMath:
+    myInt = 12345 #class variable the same for all instances
+    """“Private” instance variables that cannot be accessed except from
+    inside an object don’t exist in Python. However, there is a
+    convention that is followed by most Python code: a name prefixed
+    with an underscore (e.g. _spam) should be treated as a non-public
+    part of the API (whether it is a function, a method or a data member).
+    It should be considered an implementation detail and subject to change without notice. Since
+    there is a valid use-case for class-private members (namely to avoid name clashes of names
+    with names defined by subclasses), there is limited support for such a mechanism,
+    called name mangling. Any identifier of the form __spam (at least two leading
+    underscores, at most one trailing underscore) is textually replaced with
+    _classname__spam, where classname is the current class name with leading
+    underscore(s) stripped. This mangling is done without regard to the syntactic
+    position of the identifier, as long as it occurs within the definition of a class."""
+
+    __privateString = "Behandla som privat och blir manglad :)"
+
+    def __init__(self, x, y):
+        self.x = x #instance variables
+        self.y = y
+        print(self.__privateString)
+
+test1 = MyMath(3.14,2.718)
+test2 = MyMath(42,1337)
+print(test1.x,test1.y,test1.myInt)
+print(test2.x,test2.y,test2.myInt)
+#print(test2.__privateString)