Append a plus sign before positive numbers?

Question

I'm printing floats trimmed to 3 digits after the zero, and I'd like to know if I can conditionally append a + before positive numbers, so I get

+0.005

for a positive change and

-0.005

for a negative change. Is this easily possible from within printf?

Answer 1

Yes, just use a '+' in the format specifier.

Ex:

>>> "{0:+.03f}".format(1.23456)
'+1.235'

Answer 2

There's a + modifier for numbers. Eg. "%+d" or "%+f"