[Tutor] Looping over lists of objects

[Etrade Griffiths]

Hi

just feeling my way into Python with a  small app that reads data from file, creates objects using that data, stores the objects in a list, loops over the list doing comparison tests to filter out various objects.  Here is a code snippet:

class myObj:
    def __init__(self,a,b):
        self.a=a
        self.b=b

    def get_a(self):
        return self.a

    def get_b(self):
        return self.b


# Read data from file

L1=[]
nobj=0

for line in input:
        L0=line.split()
        a=L0[1]
        b=L0[2]
        nobj=nobj+1

        an_obj=myObj(a,b)
        
        L1.append(an_obj)

# Filter data

for i in range(1,nobj):
        for x in L1:            # ... loop over all objects in list
                a=x.get_a()             # ... get value of a from current object       
                b=x.get_b()

                if test(a,b):
                print 'test succeeded'
                else:
                print 'test failed'

Trying to debug this using IDLE.  The calls x.get_a and x.get_b always return zero so something is going wrong somewhere.  I think I'm either not storing the objects correctly or retrieving them correctly but no idea why!  All suggestions gratefully received!!!

Thanks in advance

Alun Griffiths

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