python.py

#!/usr/bin/env python2

class Foo(object):
    x = 3
    
    # [ ] 1. what's wrong with this line? how would you improve it?
    def func(self, list=[]):

        # [ ] 2. what is "list" here? what will be appended to it?
        list.append(list is [])

        # [ ] 3. what is this method returning?
        return list


class Bar():
    x = 5

    
# [ ] 4. What happens if one class is new-style but the other class is classical?
class Baz(Foo, Bar):
    def func(self, list=[]):

        # [ ] 5. What is xrange and why should we use it over range?
        # [ ] 6. What is the value of Baz.x?
        for i in xrange(Baz.x):

            # [ ] 7. What is the "yield" ekeyword? 
            # [ ] 8. What is the result of the yield?
            yield super(Baz, self).func(list)


# [ ] 9. What is this syntax called?
# [ ] 10. What does the program print?
print [x for x in Baz().func()]