On 26/02/16 04:59, kay Cee wrote: > Say I have a basic Circle class, for example: > > class Circle: > def __init__(self, radius): > self.__radius = radius > > Does adding the double underscore make this member directly inaccessible to > children of the Circle class?
The fastest way to answer that question would be for you to try it in the interpreter! >>> class C: ... def __init__(s,v): s.__v = v ... >>> class D(C): ... def __init__(s,v): C.__init__(s,v) ... def printv(s): print s.__v ... >>> d = D(5) >>> d.printv() Traceback (most recent call last): File "<stdin>", line 1, in <module> File "<stdin>", line 3, in printv AttributeError: D instance has no attribute '_D__v' >>> > Also, I'd like to know if there are any side effects to programming classes > this way? Depends what you mean by side effects. - The name gets mangled by the interpreter (actually by the compiler I think) - The variable is not directly accessible so if you need access to the data you need to write accessors and setters and/or create a property. - The code is not idiomatic Python since we mostly don't bother making things private. But those are not really side-effects in a computing sense. -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ http://www.amazon.com/author/alan_gauld Follow my photo-blog on Flickr at: http://www.flickr.com/photos/alangauldphotos _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
