Python: shuffling list, but keeping some elements frozen

Question

I\'ve such a problem:

There is a list of elements of class CAnswer (no need to describe the class), and I need to shuffle it, but with one constraint -

Answer 1

Overengineered solution: create a wrapper class that contains indexes of the unfreezed elements and emulates a list, and make sure the setter writes to the original list:

class IndexedFilterList:
    def __init__(self, originalList, filterFunc):
        self.originalList = originalList
        self.indexes = [i for i, x in enumerate(originalList) if filterFunc(x)]

    def __len__(self):
        return len(self.indexes)

    def __getitem__(self, i):
        return self.originalList[self.indexes[i]]

    def __setitem__(self, i, value):
        self.originalList[self.indexes[i]] = value

And call:

random.shuffle(IndexedFilterList(mylist, lambda c: not c.freeze))