Python is not able to compare two values

Question

a=999999
b=999999
if a is b:
    print("yes")
else:
    print("no")

The answer to the following code is no.

Why python is not able to compare a and b inspite of the fact that both the values are equal to 999999

`a is b` is checking if objects a and b are same (or memory locations of a and b are same) if you want to check if there values are same you have use` ==` instead of is — prudhvi Indana, Sep 29 '17 at 18:24
Python *is able* to compare two values, you just didn't tell it to do so. — mkrieger1, Sep 29 '17 at 18:27

score 1 · Answer 1 · answered Sep 29 '17 at 18:24

1

The correct way to compare two values for equality is:

a == b

When you use is, you're comparing object identity, not equality.

answered Sep 29 '17 at 18:24

Óscar López

1

then why does `is` works for lower values ? – Habib Ansari Sep 29 '17 at 18:27
2

@HabibAnsari because small integers are pooled, and in that case the identity check succeeds. See this article: https://davejingtian.org/2014/12/11/python-internals-integer-object-pool-pyintobject/ – Óscar López Sep 29 '17 at 18:28

score 1 · Answer 2 · answered Sep 29 '17 at 18:25

1

Try this...!

a=999999
b=999999
if a == b:
    print("yes")
else:
    print("no")

answered Sep 29 '17 at 18:25

Gowtham Balusamy

score 1 · Answer 3 · edited Sep 29 '17 at 19:34

1

You are checking if the two variables are the same obect with is. You are most likely looking for ==

a == b

edited Sep 29 '17 at 19:34

MattR

answered Sep 29 '17 at 18:27

histo

then why does `is` works for lower values such as 4 ? – Habib Ansari Sep 29 '17 at 18:28

3 Answers3