Object-Oriented Programming Accessing functions within a class without parameters(python)
<p>EDIT: I hope this is more clear on my concerns. <strong>I understood that this had to much information for the question that i was seeking an answer to. Also, expressMeal and megaMeal are on two different files. The user must enter a 1 or 2, and im suppose to call the instance variables with that.
My questions are in bold, the rest is bit of background on this program</strong></p>

<p>First off, i would like to apologize if this is confusing or if I'm not making myself clear. This is my first time writing on stackoverflow.com. </p>

<p>I have to write a python program about A fast food restaurant. It has two types of meals for customers to choose. An express meal includes meat and side item. A mega meal includes meat, side item, drink and dessert. In the both files The <strong>init</strong> method is only suppose to have the self parameter. Also i have to define a chooseMeat method to choose the meat, a chooseSide method to choose the side item, and a displayOrder method to display items ordered. this is what i have done so far.</p>

<pre><code>&gt;class ExpressMeal:
&gt;&gt;   def __init__(self):
&gt;&gt;&gt;      self._meat = ' '
         self._side = ' '
     def chooseMeat(self):       
         return self._meat
     def chooseSide(self):
         return self._side
     def displayOrder(self):
</code></pre>

<p>in both files The <strong>init</strong> method has only the self parameter. I have to use this constructor to initialize the instance variables to empty strings. I have to call the ExpressMeal constructor.<strong>Also, im suppose to call the
displayOrder method of the ExpressMeal class to this file. How can i do that?</strong> I apologize in advance, as I have not been able to work on this too much, because I don't understand how to make the expressMeal.py work.</p>

<pre><code>from expressMeal import ExpressMeal
class MegaMeal(ExpressMeal):
    def __init__(self):
         base = super()
         self._drink = ' '
         self._dessert = ' '
</code></pre>

<p>I have to import megaMeal.py to the main module file and ask the user to choose either express meal or mega meal. <strong>Also  i have to create the appropriate object and call its methods to input and display items chosen by the customer. How can i achieve this</strong>? <strong><em>I'm stuck. I don't understand how im suppose to call the variables (for expressMeal just meat, and side, but for megaMeal i have to call meat, side, drink, and dessert) to the main module, if __init__ is only suppose to have the self parameter and nothing else. Is this possible?</em></strong> 
The following shows a sample run on this program </p>

<blockquote>
  <p><code>Enter 1 for express meal 
  Enter 2 for mega meal: 1 
  You chose express meal 
  Enter 1 for chicken sandwich Enter 2 for cheese burger: 2 
  Enter 1 for fries Enter 2 for chips: 1 
  Items ordered: cheese burger fries</code></p>
</blockquote>

<p>The program is suppose to execute like this when finished
I'm not asking for it to be done for me in its entirety. But if i could get help on how to make it work with examples. Any help is hugely appreciated. Thank you in advance.</p>