human
Solve the following python programming problem given the following code:
#  Create 2 planets.  The first by passing in as input the name and diameter.
#  With the second planet we just pass in the name so the diameter takes on
#  the default value (5000 in this case).
planet1 = Planet("Crypton", 13000)
planet2 = Planet("Eternia")

print(planet1)

planet1

#  Define the class.  Planet is the name of the class.
class Planet:
    # note how i can make an argument optional, just like for functions
    def __init__(self, name, diameter = 5000):
        """The initialization of my class.
        This is a special method (function) that gets called every time you
        create a new class.  Every method in a class has "self" as the first
        parameter.  The additional parameters to __init__ are the class's
        input parameters (in this case name and diameter).  You can set a
        default value to each parameter (diameter has a default of 5000).
        """
        self.name = name
        self.diameter = diameter
        
    def __str__(self):
        s = "This is {} with a diameter of {}".format(self.name, self.diameter)
        return s
    
    def __repr__(self):
        return self.__str__()

p = Planet('Rubycon', 10000)
p
Given the above code, generate some markdown instructions for it.
assistant
#Here is the Python program you requested.

Creating and Using a Class
To recap:
To use a class you've written, you first need to create an "instance" of the class. Very much like with lists or dictionaries (in fact, dictionaries and lists are classes!). Some classes have required input parameters. Some classes have optional input parameters. Some classes have no input parameters at all.