1/2 in python shell gives 0.5 while within a program, it gives 0 -


this question has answer here:

simple question:

when 1/2 in python shell gives float value

>>> 1/2 >>> 0.5

but

sum = 0 in range(1, 20):     p = 1/i     print(p)     val = 2.0**p     sum += val     print(sum)

when run program, value of p comes 0.

what reason behind behaviour. missing?

that's because using python2.7

in python3 1/2 return 0.5

to have same results in python2.7 use this:

from __future__ import division print(1/2) # output 0.5

or suggested @mahi use:

p = 1.0/i

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