Why is id of two strings different?

Asked Jun 12 '17 at 13:59

Active Jun 12 '17 at 14:57

Viewed 49 times

Can anyone tell me why following code gives different answers?

>>> a='3x'
>>> b='3x'
>>> a is b
True

>>> a='3[x'
>>> b='3[x'
>>> a is b
False

--- EDIT ---

Thanks for the comment from Jean, so their ids are different because the strings are not cached, that make sense.

The thing that interested me is, when I try this in the PythonTutor website it returns True.

edited Jun 12 '17 at 14:57

martineau

asked Jun 12 '17 at 13:59

Deqing

1

you should use `==` not `is` – depperm Jun 12 '17 at 13:59
1

string interning works in mysterious ways. Where there are non-alphanum characters it doesn't cache. I have changed the duplicate link. – Jean-François Fabre Jun 12 '17 at 14:00

0 Answers0