title: Python instances from the same class with their own list of random numbers
body: <p>So I create a x numbers of instances from the same class, and each instance I want to have a list with 10 random numbers. The problem is when I instantiate  them it's gives to all instances the same list. I did some research and I know sort of what I'm doing wrong. Basically I think I should not be using the .append() method because it's extends the List attribute from the raw class. Here it goes</p>
  
  <pre><code>from random import randint
  
  class Vehicle():
      List = []
  
      def __init__(self):
          for i in range(10):
              Vehicle.List.append(randint(0,10))
  
  
  from Vehicle import Vehicle
  
  class Instances():
      vehicles = []
  
      def __init__(self):
          for i in range(10):
              new_vehicle = Vehicle():
              Instances.vehicles.append(new_vehicle)
  </code></pre>
  
  <p>When I instantiate the Instances class, it goes all fine, but the List attribute from each Vehicle instances are all equal and they all have length = 100. Now I got the length = 100 because is 10 instances x 10 appends each instance. The big question is, how can i have 10 instances from Vehicle class and they all have a unique list of 10 random numbers with the desired length (i.e. 10) ?  </p>