in which 2.x version was // first used?

[Skaperen]

i see that // (floordiv) is used in 2.7.12. for lots of things the documentation says in which version it was first used or defined. i don't see it for //. so i am curious if // was in Python all along or if it was added at some point, and if the latter, at which version it was added.

i see that for the numbers i picked, in version 2.7.12, both / and // always give me the same result. does this mean // was added to 2.7.12 to make the transition to Python3 easier?

[buran]

PEP-238 Implementation
python 2.2

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in version 2.7.12, both / and // always give me the same result

that is expected as / in python2 is floor division (i.e. same as //) for int
EDIT: added for int to make it clear. tnx, nilamo

[nilamo]

They're not the same in python2 for floats, only for ints. In python 2, int / int = int, but in python 3, they wanted to make sure information wasn't lost (and lots of people were confused about why the decimal wasn't in the results).

[Skaperen]

that is expected as / in python2 is floor division (i.e. same as //) for int
EDIT: added for int to make it clear. tnx, nilamo

since 2.7.12 supported // and since i believed it was intended to be for transitioning to Python3 i believed / would be the same as in python3. i believed so strongly that i didn't even test it before wondering how it might affect what i was coding today and wonder how older python2 would have this effect.

i had coded a test for version 2 and earlier to use / else use // to get the floor division behavior. now i know that code will be fine on all python2 and python3.

this code is not yet tested:

def intsize(a):
    try:
        n = int(a,0)
    except:
        n = int(a)
    if bytes == str:
        return (len(hex(n))-1)/2
    else:
        return (len(hex(n))-1)//2