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I have code that goes like this:

class A(object):  
    def __init__(self, master):  
        """Some work here"""  

    def do_this(self):  
        self.B = B.do_that()  
        print self.B[1]  


class B(object):  
    def __init__(self, master):  
        """Some work here"""  

    def do_that(self):  
        p = (1, 2)

I can't make the method in class A to use that self.B as a tuple. Help.

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2 Answers

up vote 1 down vote accepted

For starters, do_that() doesn't return anything. So calling it will pretty much do nothing.

self.B = B.do_that() also won't work. You have to first create an instance of the class B:

mything = B(your_parameters)
mything.do_that()

And if you want that to return something (i.e, the tuple), you should change your do_that() to:

def do_that(self):  
    return (1, 2)

One final note, this can all be achieved through Inheritance:

class A(B): # Inherits Class B
    def __init__(self,master):
        """Some work here""" 
    def do_this(self):
        print self.do_that()[1] # This is assuming the do_that() function returns that tuple

Using the inheritance method:

>>> class B:
...     def __init__(self, master):
...         """Some work here"""
...     def do_that(self):
...         return (1,2)
... 
>>> class A(B):
...     def __init__(self, master):
...         """Some work here"""
...     def do_this(self):
...         print self.do_that()[1] 
...
>>> mything = A('placeholder')
>>> mything.do_this()
2
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yeah okay. thank you. I wont use inheritance though, because I have to inherent from frame/object for this assignment. – user2372332 yesterday
@user2372332 Ah okay, so probably the other suggestions will help you :) – Haidro yesterday
up vote 0 down vote

First you have to instantiate B as a property of A in the method A.do_this(). The following code should work.

def do_this(self):
    b = B()
    self.B = b.do_that()  
    print self.B[1]
share|improve this answer
thank you for your response – user2372332 yesterday

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