Martin Panter added the comment:
Long story short: it is accessed due to the callable suffix check (Issue
449227), and this check is less than optimal, meaning the attribute gets
accessed up to four times per Tab press.
In 3.6, there are only two calls, one for the hasattr() call, and one for the
getattr() call:
Foo.bar called
File "/home/proj/python/cpython/Lib/rlcompleter.py", line 85, in complete
self.matches = self.attr_matches(text)
File "/home/proj/python/cpython/Lib/rlcompleter.py", line 164, in attr_matches
hasattr(thisobject, word)):
File "<stdin>", line 3, in bar
Foo.bar called
File "/home/proj/python/cpython/Lib/rlcompleter.py", line 85, in complete
self.matches = self.attr_matches(text)
File "/home/proj/python/cpython/Lib/rlcompleter.py", line 165, in attr_matches
val = getattr(thisobject, word)
File "<stdin>", line 3, in bar
Before revision 4dbb315fe667 (Issue 25011), “words” was a list rather than a
set. It gets two “bar” entries, one from dir(f) and one from dir(f.__class__).
Maybe it is worth backporting set(), I dunno.
The hasattr() call was added in r65168 (Issue 3396) as a look-before-you-leap
check to avoid the completer from dying from getattr() exceptions. IMO in this
case it is better to “ask for forgiveness” by catching Exception from
getattr(). This would be more robust to quirky and buggy attributes anyway.
Finally (or really, initially), getattr() was added in r64664 (Issue 449227). I
think even if getattr() fails, the attribute name could still be output, just
not with the callable suffix (which I partly disagree with anyway). It would
have been like that previously. But I guess this is debatable, and a separate
issue.
----------
components: +Library (Lib)
nosy: +martin.panter, serhiy.storchaka
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<http://bugs.python.org/issue25590>
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