printing objects in python

Question

I'm trying to print these car_object[objectname] objects, but not sure how to do it.... I also have a Cars class. When I do print(car_object[objectname]) I get ObjectmeA160 <__main__.Cars object at 0x027FB970>. what am I doing wrong?

def __iter__(self):
    car_object = {}
    cursor = self._db.execute('SELECT IDENT, MAKE, MODEL, DISPLACEMENT, 
      POWER, LUXURY FROM CARS')
    for row in cursor:
        car_object = {}
        objectname = 'Object'+str(row['IDENT'])
        car_object[objectname] = Cars(ident = row['IDENT'], make = row['MAKE'], 
                  model = row['MODEL'], disp = row['DISPLACEMENT'], power = row['POWER'], luxury = row['LUXURY'])
        print(car_object[objectname])
        yield dict(row)

class Cars:  
    def __init__(self, **kwargs):
        self.variables = kwargs

    def set_Variable(self, k, v):
        self.variables[k] = v

    def get_Variable(self, k):
        return self.variables.get(k, None)

That depends entirely on the Cars class. Does it have a .__str__() menthod? — Martijn Pieters
– Martijn Pieters, Commented Feb 28, 2013 at 21:36
@Martijn Pieters added Cars class...how does a __str__() would work in this case? — engr007
– engr007, Commented Feb 28, 2013 at 21:39
Are you printing anything else before that print() statement? The <__main__.Cars object at 0x027FB970> is for your Cars class, the part in front is not. — Martijn Pieters
– Martijn Pieters, Commented Feb 28, 2013 at 21:39
I am printing the objectname I create 'objectname = 'Object'+str(row['IDENT'])' — engr007
– engr007, Commented Feb 28, 2013 at 21:41

Martijn Pieters · Accepted Answer · 2013-02-28 21:42:38Z

1

The <__main__.Cars object at 0x027FB970> is the standard string for custom objects that do not implement their own .__str__() hook. You can customize it by implementing that method:

class Cars:
    # ....

    def __str__(self):
        return 'Car instance with variables: {!r}'.format(self.variables)

answered Feb 28, 2013 at 21:42

Martijn Pieters

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2 Comments

engr007 Over a year ago

how do I call this iteratively to print them all? I am getting the input from the db...which has about 30some rows so i want to print them all. do i call from main?

Martijn Pieters Over a year ago

@user2096860: You are doing it correctly to print them all. This hook gives your objects a way to be printed in a different way, so instead of <__main__.Cars object at 0x027FB970> it'll print whatever this method returns.

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