title: Attribute error: 'list' object has no attribute 'gainWeight'
body: <p>Why does my code give me the errror <code>Attribute error: 'list' object has no attribute 'gainWeight'</code> ?</p>
  
  <p>Class code: </p>
  
  <pre><code>class Pig():
  
  def __init__(self, name, age, weight, value):
      self.name = name
      self.age = age
      self.weight = weight
      self.value = value
  
  def Weight(self):
      self.weight = randrange(50,250)
  
  def growOlder(self):
      self.age += 1
  
  def gainWeight(self, weight):
      self.weight += 5
  
  def runAndGainValue(self):
      self.value += 5
  
  def __str__(self):
      a = self.name + " "
      a += str(self.age) + " "
      a += str(self.weight) + " "
      a += str(self.value) + " "
      return a
  </code></pre>
  
  <p>And the code in the main program:</p>
  
  <pre><code>def work_function():
      work = input("What do you want to do for work today?"
          "\nPress 1 to feed your animals"
          "\nPress 2 to take them out in the yard"
          "\nPress 3 to your animals to sleep"
          "\nPress 4 to go back to main menu.\n")
      if work == "1":
          yourfarm.printAnimals()
          print ("are all very happy to be fed and have gained some weight!\nLook at the weight now and see for yourself!")
          p.gainWeight(+5)
              #Here is where the problem lies.
          yourfarm.printAnimals()
  </code></pre>
  
  <p>p is a list with the items for my animals. </p>
  
  <p>I can't figure out why I'm getting this error.</p>