title: How to force python float operation on float32 rather than float64?
body: <p>I want to do some math operations (+, -, *, /) on <code>float32</code> rather than on <code>float64</code> type. I need do these operations on <code>number</code> or <code>numpy.array</code>, and also some numpy math functions, such as <code>sqrt mean</code>. How do I do this?</p>