New submission from Jethro:
Look at this simple code:
class A:
tot = 0
def __init__(self, a):
self.tot += a
x = A(3)
print(x.tot, A.tot)
Result from print:
3 0
What the interpreter did was that it first resolved self.tot to be the class
field tot, which resolves to 0, then it created an instance field tot to hold
the result 3.
This is not correct, as one single self.tot meant two different things. Two
ways to fix this:
1. report a name undefined error (interpret self.tot as instance field)
2. increase A.tot (interpret self.tot as class field)
Clearly 1 seems more naturally to Python, even though I wished python could
disallow a class field to be shadowed by instance field, which seems quite a
reasonable thing to do.
----------
components: Interpreter Core
messages: 239714
nosy: jethro
priority: normal
severity: normal
status: open
title: in-place addition of a shadowed class field
type: behavior
versions: Python 3.4
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue23824>
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