[Python-ideas] Fixing class scope brainstorm

[Guido van Rossum]

On Tue, Mar 27, 2018 at 6:56 AM, Nick Coghlan <ncoghlan at gmail.com> wrote:

> [...] The implicit functions used in the
> comprehension & generator expression cases are just potentially
> simpler to handle, as we don't care about their API signatures, which
> means we can freely pollute their APIs with eager name bindings if we
> choose to do so. [...]
>

Hm, so maybe we shouldn't touch lambda, but we can at least fix the scope
issues for comprehensions and genexprs.

There may still be breakage, when the code defines a global x that is
overridden by a class-level x, and a class-level comprehension references x
assuming it to be the global. So we need to tread carefully even here --
but this case is weird already:

x = 42
class C:
    x = [1, 2, 3]
    z = [x+y for y in x]  # [43, 44, 45]

-- 
--Guido van Rossum (python.org/~guido)
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