New submission from Ezio Melotti:
Pressing <tab> to invoke autocompletition on instances repeatedly accesses
attributes/descriptors values:
>>> # <tab> is used to indicate when/where I press <tab>
>>> class Foo:
... @property
... def bar(self): print('Foo.bar called')
...
>>> f = Foo()
>>> f.<tab>Foo.bar called
Foo.bar called
Foo.bar called
Foo.bar called
<tab>Foo.bar called
Foo.bar called
Foo.bar called
Foo.bar called
<tab>
f.__class__( f.__doc__ f.__getattribute__( f.__le__(
f.__new__( f.__setattr__( f.__weakref__
f.__delattr__( f.__eq__( f.__gt__( f.__lt__(
f.__reduce__( f.__sizeof__( f.bar
f.__dict__ f.__format__( f.__hash__( f.__module__
f.__reduce_ex__( f.__str__(
f.__dir__( f.__ge__( f.__init__( f.__ne__(
f.__repr__( f.__subclasshook__(
>>> f.b<tab>Foo.bar called
Foo.bar called
Foo.bar called
Foo.bar called
ar<enter>
Foo.bar called
Each time I press <tab>, the property is called 4 times. I'm not sure why the
value is accessed at all, but even if there was a valid reason to do so, doing
it once should be enough.
----------
messages: 254415
nosy: ezio.melotti
priority: normal
severity: normal
stage: test needed
status: open
title: tab-completition on instances repeatedly accesses attribute/descriptors
values
type: behavior
versions: Python 3.4, Python 3.5, Python 3.6
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue25590>
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