In the example below I would like to format to 1 decimal place but python seems to like rounding up the number, is there a way to make it not round the number up?

>>> '{:.1%}'.format(0.9995)

'100.0%'

>>> '{:.2%}'.format(0.9995)

'99.95%'

解決方案

If you want to round down always (instead of rounding to the nearest precision), then do so, explicitly, with the math.floor() function:

from math import floor

def floored_percentage(val, digits):

val *= 10 ** (digits + 2)

return '{1:.{0}f}%'.format(digits, floor(val) / 10 ** digits)

print floored_percentage(0.995, 1)

Demo:

>>> from math import floor

>>> def floored_percentage(val, digits):

... val *= 10 ** (digits + 2)

... return '{1:.{0}f}%'.format(digits, floor(val) / 10 ** digits)

...

>>> floored_percentage(0.995, 1)

'99.5%'

>>> floored_percentage(0.995, 2)

'99.50%'

>>> floored_percentage(0.99987, 2)

'99.98%'

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