Question

How to shorten the float result I got? I only need 2 digits after the dot. Sorry I really don’t know how to explain this better in English…

Thanks

Answer 1

From The Floating-Point Guide’s Python cheat sheet:

"%.2f" % 1.2399 # returns "1.24"
"%.3f" % 1.2399 # returns "1.240"
"%.2f" % 1.2 # returns "1.20"

Using round() is the wrong thing to do, because floats are binary fractions which cannot represent decimal digits accurately.

If you need to do calculations with decimal digits, use the Decimal type in the decimal module.