#! /usr/bin/env python2

class Cls(object):
  def __init__(self, value):
    self.value = value

x = [Cls(value) for value in range(10)]
# y = x[:]
y = list(x)

y.pop()
y[0].value = 42

print [datum.value for datum in x]
print [datum.value for datum in y]
