On Wednesday 29 May 2002 07:28 pm, Raymond Hettinger wrote:
...
> strings. That way, we can get O(1) behavior instead of O(n) behavior for
> code like: if c in str.printable: c='*'. If someone needs to know the
> contents, they can run str.printable.keys(). Also, because the dictionary
> is mutable, someone can (at runtime) expand or contract the definitions:
> str.whitespace.append('_').
append would of course not work on a dictionary, but the prospect of
allowing easy mutation of fundamental built-ins is quite negative in Python --
goes against the grain of the language. A read-only dictionary might be OK.
Alex
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