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?

class="post-text" itemprop="text">

class="normal">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.