This issue tracker has been migrated to GitHub, and is currently read-only.
For more information, see the GitHub FAQs in the Python's Developer Guide.

Author serhiy.storchaka
Recipients ezio.melotti, gvanrossum, pitrou, serhiy.storchaka
Date 2013-02-09.16:51:54
SpamBayes Score -1.0
Marked as misclassified Yes
Message-id <>
There are two overheads: an attribute lookup and a function call.

$ ./python -m timeit -s "a = 'hundred'"  "'x' in a"
10000000 loops, best of 3: 0.0943 usec per loop
$ ./python -m timeit -s "a = 'hundred'"  "a.__contains__('x')"
1000000 loops, best of 3: 0.271 usec per loop
$ ./python -m timeit -s "a = 'hundred'"  "a.__contains__"
10000000 loops, best of 3: 0.135 usec per loop

Time of "a.__contains__('x')"  is greater than the sum of times of "a.__contains__" and "'x' in a".
Date User Action Args
2013-02-09 16:51:54serhiy.storchakasetrecipients: + serhiy.storchaka, gvanrossum, pitrou, ezio.melotti
2013-02-09 16:51:54serhiy.storchakasetmessageid: <>
2013-02-09 16:51:54serhiy.storchakalinkissue17170 messages
2013-02-09 16:51:54serhiy.storchakacreate