What is "lambda x=x : ... " ?
fredrik at pythonware.com
Thu Jan 10 20:52:07 CET 2008
Mike Meyer wrote:
>>>> What does "y=y" and "c=c" mean in the lambda function?
>>> Older versions of python didn't make variables in an outer scope
>>> visible in the inner scope. This was the standard idiom to work
>>> around that.
>> lexically scoped free variables and object binding are two different
>> things, and have different semantics. the former does not always
>> replace the latter.
and what? it's not the same thing. the "newer" idiom only replaces
the "older" idiom under certain circumstances (such as in the OP's first
example, but *not* in his second example).
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