Add a "replace" method to tuples that returns a new tuple with the element at a
given index replaced with a given value. Example implementation:
def replace(self, index, value):
return self[:index] + (value,) + self[index + 1:]
See
https://stackoverflow.com/questions/11458239/how-to-change-values-in-a-tuple
for more context.
Currently, tuples have 2 public methods: index and count. replace would be
similarly easy to implement and similarly useful.
Furthermore, it would be a natural counterpart to nametuple's _replace method.
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