CODEWITHSUNDEEP
python
user522745
user522745

Reputation: 161

create a class list dont allow duplicated entries

i'm trying to create a class does not allow duplicate entryies

class QSet(list):
    def __init__(self,*args):
        super(QSet, self).__init__(args[0])
        self=list(set(self))

and when try to test the class duplicated entries not removed 

d=["a","b","a","z","a"]
z=QList(d)       

print d  
print z

any suggestion to solve this Thanks

Upvotes: 0

Views: 103

Answers (4)

KarlsFriend
KarlsFriend

Reputation: 745

There is already a class in Python for that. It is called set

d=["a","b","a","z","a"]
z=set(d)       

print d  
print z

Does this work for you?

Upvotes: 0

Yuval Adam
Yuval Adam

Reputation: 165282

You know that set is exactly the class you are building, right?

>>> s = set([1,2,3,3,3])
>>> s.add(4)
>>> s
set([1, 2, 3, 4])
>>> s.add(4)
>>> s
set([1, 2, 3, 4])

Upvotes: 0

Ned Batchelder
Ned Batchelder

Reputation: 375734

You could do what you want with a small change to your code:

class QSet(list):
    def __init__(self, a):
        super(QSet, self).__init__(list(set(a)))

I changed how you use the constructor args, because its odd to accept arbitrary arguments, but then insist there be at least one, and ignore all the rest.

Upvotes: 4

David Robinson
David Robinson

Reputation: 78610

Reassigning self doesn't actually change the object (you're just rebinding the identifier self to a new object). You could change the line to:

    self[:] = list(set(self))

Upvotes: 3

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