Formatting integers and floats inside strings in python

Question

I'm trying to figure out how to print formatted strings rounding to significant figures. Say I have:

x = 8829834.123

And I want to print it rounded to four sig figs, as an integer. I tried:

print "%4d"%x

and I just get:

Why won't it display:

8829000?

I thought that was how string formatting worked.

Have a look at this question: stackoverflow.com/questions/3348825/…. You could consider the use of round() as mentioned in the accepted answer. — Bharat
– Bharat, Commented Dec 17, 2012 at 7:02

jfs · Accepted Answer · 2012-12-17 07:32:35Z

4

To round to 4 significant digits:

f = float("%.4g" % 8829834.123)

To print it as an integer:

print "%.0f" % f # -> 8830000

answered Dec 17, 2012 at 7:32

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Comments

Abhijit · Accepted Answer · 2012-12-17 07:19:42Z

Format Specifier does not support integer rounding, there may be some solutions but not out of the Box, here are couple of them

>>> print "{:d}000".format(int(x/1000)) 8829000 >>> print "{:d}".format(int(round(x,-3))) 8830000

It won't produce result rounded to 4 significant digits if x has different order of magnitude e.g., 123456789