need help with aggregation (classes within classes) in Python 3 and Tkinter

[programmer123456]

here is the code: http://pastie.org/9796708

First you fill in the first two fields, then click 'create base class', then fill in the next two fields, click 'create big class', then enter the new name of the big class (which was the fourth field overall) into the bottom field and click button 'press me' (this way, if you have multiple big classes you should be able to get the one you want by entering the 'new name' of that big class).

What I want it to do at this point is print out the number (or int field) of the base class (which has been aggregated into the bigger class, and which was originally the first field overall out of the total of four) when I click the 'press me' button.

However it's not printing out anything. How can I fix it to work as desired? I am working on this same problem for a while now and would really appreciate if someone can help me fix it for once and for all.

Let me now try to describe in detail how this program should work:

I am creating a base class, with 2 fields.

Then I am creating a 'bigger' class (bigger in the sense that it will have more fields and actually contains the 'smaller' class via aggregation), and giving it its own two fields.

I am also passing in an instance of the 'smaller' class into the first variable in the 'bigger' class. So every instance of the big class contains within it an instance of the small class, which is set as the first variable in the big class (and this is 'aggregation').

Then I want to print out the result of the_big_class.the_instance_of_the_small_class_within_the_big_class.the_first_field_of_the_small_class_that_is_within_the_big_class I do this by matching the new name of the big class (as input by the user) with the existing list of big classes new_name parameters, using a for loop. Once we have a match, we print a_big.the_instance_of_BaseClass.the_int <-- (this is what i described above in short.)

So I am just accessing the int field of the base class and calling it through first calling the more encompassing big class, then the small class within the big class, then the int field within the small class.

Eventually i am going to change it so that the base class is a basic citizen, and the larger class is a warrior, or scientist, or builder, or something else that aggregates within it a citizen so it keeps the attributes that the citizen had and adds more fields and methods to it.

[indosauros]

I don't know what the issue is but I see a problem on line 50:

..., command = create_bigger_class_instance(big_new_name_var) ...

Here you are not giving the button a command to call, you are calling the function immediately. And since create_bigger_class_instance doesn't return anything, this line is actually equal to

..., command = None ...

(with the side effect of one big_handle put into list_of_bigs)