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Re: hasattr() or "x in y"?

From Grant Edwards <invalid@invalid.invalid>
Newsgroups comp.lang.python
Subject Re: hasattr() or "x in y"?
Date 2016-03-11 22:00 +0000
Organization PANIX Public Access Internet and UNIX, NYC
Message-ID <nbvf69$105$1@reader1.panix.com> (permalink)
References <nbve7c$nbo$1@dont-email.me>

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On 2016-03-11, Charles T. Smith <cts.private.yahoo@gmail.com> wrote:
> From the performance point of view, which is better:

> - hasattr()
> - x in y

Dunno, is red an even or odd color?  How many pancakes does it take to
cover a doghouse?

>>> "x" in "asdf"
False
>>> "x" in "xyz"
True

>>> "asdf".hasattr("x")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'str' object has no attribute 'hasattr'
>>> "xyz".hasattr("x")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'str' object has no attribute 'hasattr'

Since they behave differently, perhaps the question ought to be "which
does what you want to do?"

-- 
Grant Edwards               grant.b.edwards        Yow! I had pancake makeup
                                  at               for brunch!
                              gmail.com

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hasattr() or "x in y"? "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-03-11 21:44 +0000
  Re: hasattr() or "x in y"? Chris Angelico <rosuav@gmail.com> - 2016-03-12 08:55 +1100
  Re: hasattr() or "x in y"? "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-03-11 21:53 +0000
    Re: hasattr() or "x in y"? Chris Angelico <rosuav@gmail.com> - 2016-03-12 09:04 +1100
    Re: hasattr() or "x in y"? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-11 22:05 +0000
  Re: hasattr() or "x in y"? Grant Edwards <invalid@invalid.invalid> - 2016-03-11 22:00 +0000
    Re: hasattr() or "x in y"? "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-03-11 22:18 +0000
      Re: hasattr() or "x in y"? Grant Edwards <invalid@invalid.invalid> - 2016-03-11 22:30 +0000

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