[Python-Dev] Explicit Lexical Scoping (pre-PEP?) (original) (raw)

Ka-Ping Yee python-dev at zesty.ca
Thu Jul 13 00:38:44 CEST 2006

On Thu, 13 Jul 2006, Fredrik Lundh wrote:

Boris Borcic wrote:

>> note that most examples of this type already work, if the target type is >> mutable, and implement the right operations: >> >> def counter(num): >> num = mutableint(num) >> def inc(): >> num += 1 >> return num >> return inc [...] feel free to replace that += with an .add(1) method call; the point wasn't the behaviour of augmented assigment, the point was that that the most common use pattern involves mutation of the target object.

I don't think that's clear. In:

a = 1
b = a
a += 1

it doesn't seem common to me that one would expect b to become 2. Sometimes you want mutation, sometimes you don't. I don't think that necessarily follows from whether you are accessing a free variable.

-- ?!ng

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