I have some values that I need to print in scientific notation (values of the order of 10^-8, -9) But I would like to don't print a long number, only two digits after the .
something as:
9.84e-08
and not
9.84389879870496809597e-08
How can I do it? I tried to use "%.2f" % a
where 'a' is the number containing the value but these numbers appear as 0.00
试试这个:
print "%.2e"%9.84389879870496809597e-08 #'9.84e-08'
This works with format
function of the string (as %
may be soon deprecated)
>>> n
9.843898798704968e-08
>>> print ("{0:.2e}".format(n))
9.84e-08
%f stands for Fixed Point and will force the number to show relative to the number 1 (1e-3 is shown as 0.001). %e stands for Exponential Notation and will give you what you want (1e-3 is shown as 1e-3).
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