There is a significant semantic difference (beyond performance considerations): when the attribute is defined on the instance (which is what we usually do), there can be multiple objects referred to. Each gets a totally separate version of that attribute. when the attribute is defined on the class, there is only one underlying object referred to, … Read more
There are built-in functions called getattr and setattr getattr(object, attrname) setattr(object, attrname, value) In this case x = getattr(t, ‘attr1’) setattr(t, ‘attr1’, 21)
Try hasattr(): if hasattr(a, ‘property’): a.property See zweiterlinde’s answer below, who offers good advice about asking forgiveness! A very pythonic approach! The general practice in python is that, if the property is likely to be there most of the time, simply call it and either let the exception propagate, or trap it with a try/except … Read more
Because do is reserved keyword in PHP. Demo of do as method name. (An error) Demo without do, successfull outputs 2 You should change method name from do to something else since it is reserved keyword used in do-while loop.