Is Python a

Note that it’s important to copy the start value by appending instead of slicinghere because otherwise the result may not be a true list, and so will not respondto expected list methods, such as append (e.g., slicing a string returns anotherstring, not a list). You would be able to copy a MyList start value by slicingbecause its class overloads the slicing operation, and provides the expected listinterface; however, you need to avoid slice-based copying for objects such asstrings. Also, note that sets are a built-in type in Python today, so this is largelyjust a coding exercise (see Chapter 5 for more on sets).3. Subclassing. My solution (mysub.py) appears below. Your solution should besimilar:from mylist import MyListclass MyListSub(MyList):calls = 0def _ _init_ _(self, start):self.adds = 0MyList._ _init_ _(self, start)def _ _add_ _(self, other):MyListSub.calls = MyListSub.calls + 1self.adds = self.adds + 1return MyList._ _add_ _(self, other)def stats(self):return self.calls, self.adds# Shared by instances# Varies in each instance# Class-wide counter# Per-instance counts# All adds, my addsif __name__ == '_ _main_ _':x = MyListSub('spam')y = MyListSub('foo')print x[2]print x[1:]print x + ['eggs']print x + ['toast']print y + ['bar']print x.stats( )% python mysub.pya['p', 'a', 'm']['s', 'p', 'a', 'm', 'eggs']['s', 'p', 'a', 'm', 'toast']['f', 'o', 'o', 'bar'](3, 2)4. Metaclass methods. I worked through this exercise as follows. Notice that operatorstry to fetch attributes through _ _getattr_ _, too; you need to return a valueto make them work:>>> class Meta:... def _ _getattr_ _(self, name):... print 'get', namePart VI, Classes and OOP | 667