getting the fractional part of a real?

[Roy Smith]

What's the best way to get the fractional part of a real? The two ways I
can see are r % 1 and r = int(r), but both seem a bit hokey. Is there
something more straight-forward that I'm missing, like fraction(r)?

 

[Mark Dickinson]

(0.5, 1.0)

What Christian said. math.fmod(r, 1.0) also works.

Note that r % 1 and r - int(r) aren't the same thing for negative
reals.
What sign do you want the result to have when r is negative?

Mark

 

[Gregor Lingl]

(0.5, 1.0)

Christian

Or without the need to import something:

Gregor

 

[Roy Smith]

Or without the need to import something:


Gregor

Thanks. I knew I had to be missing something obvious.

Regarding Mark Dickinson's question about what I want for negative reals,
for the application I have in mind, r is guaranteed to be positive.