How do I Round Numbers ?

[SpectrumUSR]

Ok the story so far, using IDLE 2 or IDLE 3

If I include the line Import math at the start of the program

I can use math.sqrt( x) # to get the Square root of x

So is there a Round function I can use to clean up the answer to
One decimal place ?

Eg convert 15.634719 .... to 15.6 # turns of wire thro a Powered Iron core .
I have looked in Raspberry Pi users guide Not found the answer!

In GFA v3 for the ATARI
I could use ROUND (x,1) Function
So
What do I use in IDLE 2 or IDLE 3

Thanks de John.

[joan]

Write your own function.

To round to one decimal place add 0.05, multiply by 10, take the integer value, then divide by 10.

[DirkS]

According to the docs Python has the same function: http://docs.python.org/2/library/functions.html#round

Gr.
Dirk.

[SpectrumUSR]

Thanks for the Help in sorting that out.

How I thought the Function would work was:

The same as turns=math.sqrt(turns)... To find the square root.

So I tried
turns=math.round(turns,1). ... Which did'nt work came up with error

turns=round(turns,1). Works thanks Dirk and Joan.

John.

[Redrobes]

I agree with joan's answer which is perfect for this case of sqrt.

But for the case where people may come across this thread for something else and the numbers to be rounded can be negative then you need to sort that out first.

Something like this:

if( num < 0 )
{
pos = -num;
pos += 0.05
pos *= 10
pos = (int)pos
num = -pos / 10
}
else
{
pos += 0.05
pos *= 10
pos = (int)pos
num = pos / 10
}