this simple python code, why it doen't work?

Question

class obj:
    def __init__(self, a):
        self.a = a
class obj2 :
    def __init__(self, a):
        self.a = a

pList = [obj(1),obj(2),obj(3),obj(4),obj(5)]
list = []

for i in pList:
    obj2(i.a)
    list.append(obj2)

for i in list :
    print(i.a)

Hi friend. Im python newBie. I have this code but it doesn't work.
please teach me.. thank you

Traceback (most recent call last):
  File "D:/..py", line 18, in <module>
    print(i.a)
AttributeError: type object 'obj2' has no attribute 'a'

Process finished with exit code 1

you're mixing up class with instance. and don't use list for your variables. And don't call your files ..py. — Jean-François Fabre
– Jean-François Fabre ♦, Commented Nov 3, 2016 at 13:01

Daniel Roseman · Accepted Answer · 2016-11-03 13:01:47Z

9

Because you throw away the instance of obj2 that you create in the list, and then append the class itself. It should be:

for i in pList:
    o2 = obj2(i.a)
    list.append(o2)

Note that this would be more obvious if you used standard naming conventions, calling your classes Obj and Obj2.

answered Nov 3, 2016 at 13:01

Daniel Roseman

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1 Comment

M.SeongHyun Over a year ago

Thank you Daniel !

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