Force Python calculation in double

I want to print a double in Python. But it doesn't work, and I don't know why.

My code:

test = 3000 / (1500 * 2000)
print str(test)

I always get a 0 and not a 0.001 even if I do the following:

test = 3000 / (1500 * 2000)
print '%.10f' % test

I get a 0.000000000 and not 0.001.

How do I tell Python that this should be a double?

Answer

In Python 2.x you need to convert at least one of the operands to float, as integer division results in truncated output in Python 2.x:

>>> 3000 / (1500 * 2000)
0
>>> 3000.0 / (1500 * 2000) # Or use float(3000)
0.001
>>> float(3000) / (1500 * 2000)
0.001

Or you can import division of Python 3.x in Python 2.x, where integer division results in true division:

>>> from __future__ import division
>>> 3000.0 / (1500 * 2000)
0.001

Note that this will affect the division in the whole module.