[Baypiggies] rounding off problem
Vikram K
kpguy1975 at gmail.com
Wed Mar 23 16:34:44 CET 2011
how does one round off a float number in python? i have tried this using two
ways but have been unsuccessful so far:
1. IDLE 2.6.6 ==== No Subprocess ====
>>> x = 3.5666666
>>> x = round(x,3)
>>> x
3.5670000000000002
[ The above works when i try doing x = round(x,2). I am working on a windows
machine. The above seems to work on the linux machine of a colleague but he
gets the same problem when he tries x = round(x,4)]
2. >>> from decimal import *
>>> getcontext().prec = 3
>>> x = decimal(3.456654)
>>> x = Decimal('3.2213333')
>>> x
Decimal('3.2213333')
>>> getcontext().prec = 5
>>> x
Decimal('3.2213333')
>>> y = round(x,3)
>>> y
3.2210000000000001
>>> x = 3.223344
>>> z = round(x,3)
>>> z
3.2229999999999999
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