[Tutor] subclass of list

[Bob Gailer]

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Your reference to UserList helped. One thing I missed was that the internal 
list can be set by passing a list as the argument to the instantiation call.

 >>> class UL(UserList):pass
 >>> ul=UL([1,2,3])
 >>> ul
[1,2,3]
 >>> ul.data
[1,2,3]

AND (using list instead of UserList)
 >>> class UL(llist):pass
 >>> ul=UL([1,2,3])
 >>> ul
[1,2,3]

HOWEVER:
 >>> ul.data
AttributeError: 'UL' object has no attribute 'data'

A little "thinking and experimenting" led to: instead of manipulating 
self.data one now manipulates self:

 >>> class UL(list):
...     def a(self):
...             self[0]+=1
 >>> ul=UL([1,2,3])
 >>> ul.a()
 >>> ul
[2, 2, 3]


Bob Gailer
mailto:ramrom@earthling.net
303 442 2625

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