Author Topic: I have half broken Python Code  (Read 1881 times)

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Offline Jonius7

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I have half broken Python Code
« on: October 09, 2013, 01:43:46 am »
Here is the current state of my half broken python code for a uni assignment. I am having the most worries/errors about trying to call variables between classes.
Thinking possibly to change
class MazeApp(Frame): 

class MazeApp(Object):
so I can call objects, but it's giving me errors such as:

TypeError: unbound method get_size() must be called with Maze instance as first argument (got nothing instead)
TypeError: unbound method make_maze() must be called with MazeGenerator instance as first argument (got str instance instead)

I don't know what to expect.

There is a assign2.py file which is the main code, and mazegenerator.py which is support code given (not to be changed). My work is in the assign2.py file.
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Offline TravisE

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Re: I have half broken Python Code
« Reply #1 on: October 09, 2013, 02:55:19 am »
Edit: Actually, the exception to the below is when you're subclassing another class and call the parent class's method. I just realized you mentioned changing MazeApp to subclass object instead of Frame. This won't work if you are trying to extend/call Frame's methods, because they are no longer available if you're not basing the new class on it.

I don't understand exactly why you want to change it to "class MazeApp(object)", though. This is only necessary (in Python 2) when creating a parent class. Frame most likely eventually subclasses object at some point, so this is unnecessary.

Or, are you referring to trying to subclass a class called 'Object', rather than the built-in class 'object'?

Those errors can be generated when there's an attempt to call a class's methods directly, without first creating an instance and assigning it to a variable. For example, if you have a class like

Code: [Select]
class Foo(object):
    def bar(self):
        print 'blah'

Make sure you're doing something like

Code: [Select]
f = Foo()
f.bar()

and not

Code: [Select]
Foo.bar()
« Last Edit: October 09, 2013, 03:22:45 am by TravisE »
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Offline Jonius7

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Re: I have half broken Python Code
« Reply #2 on: October 09, 2013, 06:03:37 pm »
Maze __init__ requires 2 arguments (self, string)
and say for instance I wanted to call _get_size() from Maze class in a method of MazeApp class
I've tried Maze._get_size(), Maze()._get_size() but Maze requires 2 arguments (including self), and I can't get that to work.

I don't want to call Maze __init__, I want to call Maze._get_size() but it requires having Maze __init__ anyway.
No self won't work since self will just reference the MazeApp class.


If Maze __init__ was just 1 argument (self), then I could call any method of Maze with Maze().[methodname]()
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Offline TravisE

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Re: I have half broken Python Code
« Reply #3 on: October 09, 2013, 08:52:11 pm »
If you're subclassing Maze, then calling Maze._get_size(self, string) from a MazeApp method should be correct. The self in this case does refer to the MazeApp instance, but this is how it works in Python.
« Last Edit: October 09, 2013, 08:52:29 pm by TravisE »
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