More python - entering decimals with int(raw_input

[BigFoot13]

I have written a section of code in a program I am constructing as a project in my free time:

def s():
     print 'Hard Disk Sustained Transfer Rate Calculator'
     surfaces = int(raw_input('Enter the number of surfaces : '))
     sectorspertrack = int(raw_input('Enter the number of sectors per track : '))
     headtime = int(raw_input('Enter the head switch time in ms : '))
     cylindertime = int(raw_input('Enter the cylinder switch time in ms : '))
     latency = int(raw_input('Enter the average latency in ms : '))
     str = ((surfaces * sectorspertrack * 512) / (2 * surfaces * latency + (surfaces - 1) * headtime + cylindertime)) / 1000000
     return str

In the input for average latency, cylinder switch time, and head switch time, there is often a decimal to input (ex. 1.5). I get an error when I do this, though.

ValueError: invalid literal for int() with base 10: '1.5'

What should I put in for the input so I can enter decimals for the equation?

Thanks,
BigFoot

[Juan Pablo]

You need to use a float instead of int to enter decimals

[danbuter]

Be aware that float can get a bit funny on long calculations. If you're only going a couple decimal places, it probably won't matter, though.