What do numbers starting with 0 mean in python?

Question

When I type small integers with a 0 in front into python, they give weird results. Why is this?

>>> 011
9
>>> 0100
64
>>> 027
23
<         


        

Answer 1

They are apparently octal (base 8) numbers, and the 0 is just an outdated prefix that Python 2 used to use.

In Python 3 you must write: 0o11 instead.

They are still integers but doing operations with them will give a result in regular base-10 form.