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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.