Implementation of a queue for digicode-like system
Some PEP8 guidance:

class MyQueue(): here, you can remove the redundant parentheses as you're not passing any parameter to it. So you will have class MyQueue.  

When inside of a class, it's recommended to have one space between your methods:

def addItem:
    ....

def printQueue:
    ....


It's also specified in PEP8 the following (methods naming):


  Use the function naming rules: lowercase with words separated by
  underscores as necessary to improve readability.


That said, addItem would become add_item.

More

Don't use &lt;&gt; operator. It's not usual. I strongly recommend you using != operator (which is the common way of doing this) when you're trying to say not equal. Later on, you might want to use this with a more recent Python version (say Python 3.5). This way, you won't have any issues. 

Related to portability, you might also want to add parentheses when using print(). It's not necessary since you're using Python 2.7, but it might help you in the future.

Classes and methods inside them usually have docstrings. To quote the documentation:


  A docstring is a string literal that occurs as the first statement in
  a module, function, class, or method definition. Such a docstring
  becomes the doc special attribute of that object.
  
  All modules should normally have docstrings, and all functions and
  classes exported by a module should also have docstrings.


That said:

class MyQueue:
    """Some text to describe what you're class does"""
    ....

    def add_item(self, value):
        """ what this method does """
        ...


In a perfect world, which obviously we're not living in, I would've expect to see some push / pop methods or queue / dequeue ones since we're talking about a queue implementation and it's way of handling things (FIFO). Perhaps add_item might be push_item.

More to come