Creating a list of objects in Python

class SimpleClass(object):
    pass

x = SimpleClass
# Then create an empty list
simpleList = []
#Then loop through from 0 to 3 adding an attribute to the instance 'x' of SimpleClass
for count in range(0,4):
    # each iteration creates a slightly different attribute value, and then prints it to
# prove that step is working
# but the problem is, I'm always updating a reference to 'x' and what I want to add to
# simplelist is a new instance of x that contains the updated attribute

x.attr1= '*Bob* '* count
print "Loop Count: %s Attribute Value %s" % (count, x.attr1)
simpleList.append(x)

print '-'*20
# And here I print out each instance of the object stored in the list 'simpleList'
# and the problem surfaces.  Every element of 'simpleList' contains the same      attribute value

y = SimpleClass
print "Reading the attributes from the objects in the list"
for count in range(0,4):
    y = simpleList[count]
    print y.attr1

# So how do I (append, extend, copy or whatever) the elements of simpleList so that each entry
# contains a different instance of the object instead of all pointing to the same one?

for count in xrange(4):
    x = SimpleClass()
    x.attr = count
    simplelist.append(x)

simplelist = [SimpleClass(count) for count in xrange(4)]

instancelist = [ MyClass() for i in range(29)]

instancelist[5].attr1 = 'whamma'

x = SimpleClass

x = SimpleClass()

import copy

x = SimpleClass()

for count in range(0,4):
  y = copy.deepcopy(x)
  (...)
  y.attr1= '*Bob* '* count