On 01/07/2010 14:11, Richard D. Moores wrote:
On Thu, Jul 1, 2010 at 04:57, Steven D'Aprano<st...@pearwood.info> wrote:
On Thu, 1 Jul 2010 06:26:21 pm Richard D. Moores wrote:
x = 2000000000000034
x/2
1000000000000017.0
print(x/2)
1e+15
I was expecting, in fact needing, 1000000000000000017 or
1000000000000000017.0
1e+15 is unsatisfactory. Am I forced to use the decimal module?
This is not an issue with print, this is an issue with floats -- they
produced a rounded, approximate value when converted to a string. print
merely prints that string:
x = 1e15 +17
x
1000000000000017.0
print(x)
1e+15
str(x)
'1e+15'
If you want more control over the string conversion, you can do
something like this:
print(repr(x))
1000000000000017.0
print('%.5f' % x)
1000000000000017.00000
Thanks to yours and others responses, I've learned some things I
didn't know, but remember, I'm starting with long ints such as
x = 2000000000000034, cutting it in half, and hoping to print
1000000000000017 or 1000000000000017.0
(I also need to divide odd ints like 2000000000000033 and print
1000000000000017.5)
(In my initial post, I used a smaller x, x = 2000000000000034. I
should have made it longer, to reflect the ints I'm dealing with (big
primes and their near neighbors).
I'm still hoping to be saved from the decimal module :) .
I think that we can manage that. :)
Dick
_______________________________________________
Tutor maillist - Tutor@python.org
To unsubscribe or change subscription options:
http://mail.python.org/mailman/listinfo/tutor
Take a look at section 7.1.3 here.
http://docs.python.org/py3k/library/string.html#string-formatting
This is the recommended way to format strings in Python 3.
Kindest regards.
Mark Lawrence.
_______________________________________________
Tutor maillist - Tutor@python.org
To unsubscribe or change subscription options:
http://mail.python.org/mailman/listinfo/tutor
