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Code: Alles auswählen

class MyList(list):
    def append(self, value):
        print "append:", value
        list.append(self, value)

    def extend(self, value):
        print "extend:", value
        list.extend(self, value)

    def insert(self, index, value):
        print "insert %r at position: %i" % (value, index)
        list.insert(self, index, value)

    def __repr__(self):
        repr = "my own repr: >>>%s<<<" % list.__repr__(self)
        return repr

    def test(self):
        for item in list:
            print item

l = MyList()
l.append("FooBar")
l.extend(["Foo", "Bar"])
l.insert(0, "First!")
l += [1,2,3]

print l

print "-"*80

l.test()

Code: Alles auswählen

append: FooBar
extend: ['Foo', 'Bar']
insert 'First!' at position: 0
my own repr: >>>['First!', 'FooBar', 'Foo', 'Bar', 1, 2, 3]<<<
--------------------------------------------------------------------------------
Traceback (most recent call last):
  File "test.py", line 33, in <module>
    l.test()
  File "test.py", line 20, in test
    for item in list:
TypeError: 'type' object is not iterable

Code: Alles auswählen

>>> class MyList(list):
...     def test(self):
...         for item in self:
...             print item
...
>>>
>>> foo = MyList([1,2,3,4])
>>> foo.test()
1
2
3
4

Code: Alles auswählen

>>> class mylist(list):
...     def test(self):
...         for item in self:
...             print item