python3 division operator exactly like in python2

Question

I (really, really) need division operator in Python3 behaves like in Python2.

Python2 code:

--> 11/5
2
--> 11.0/5
2.2

But in Python3 we have

--> 11//5
2
--> 11.0//5
2.0

I can change / to // or whatever, but I expect the same results. Any ideas?

You can't make the Python 3 / operator behave like the Python 2 one. If you want integer division is Python 3, you must use //. There is no way to get an operator in Python 3 that sometimes does integer division and sometimes does float division; the whole point of changing this in Python 3 was to cleanly separate those two operations. You would need to write your own function that checks the types and uses the operator you want. — BrenBarn
– BrenBarn, Commented May 30, 2014 at 7:28
Do you really need one operator that does floor division for ints and true division for floats, or can you use the appropriate operator for the appropriate types? — user2357112
– user2357112, Commented May 30, 2014 at 7:29
I really need that feature because my css preprocessor serves arithmetic operations to users by eval(). And for CSS that behavior was perfect: VALUE_IN_PIXELS/2 -> integer, FLOAT_VALUE_IN_EM -> float — Tomek Wyderka
– Tomek Wyderka, Commented May 30, 2014 at 16:06

salezica · Accepted Answer · 2014-05-30 07:30:59Z

5

You can't make it work like that. You'll have to use / and // when appropriate.

If, for some reason, you need the "polymorphism" of the old operator, you can...

def div(a, b):
    if isinstance(a, int):
        return a // b
    else:
        return a / b

answered May 30, 2014 at 7:30

salezica

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2 Comments

Tomek Wyderka Over a year ago

OK. Because it's not possible, I just truncate result when input was all integers. I mean input of my arithmetic calculator which is provide by eval() in one css preprocessor I'm developing.

Tomek Wyderka Over a year ago

and in python2 i use import future

APhillips · Accepted Answer · 2020-01-29 06:41:09Z

0

You can use this code, for support of your old code. It works with other keywords too.

from __future__ import division

I hope it helps

edited Jan 29, 2020 at 6:41

APhillips

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answered Jan 29, 2020 at 0:06

Nicolas C

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