How to check the size of a float in python?

Question

I want to check whether a float is actually 32 or 64bits (and the number of bits of a numpy float array). There should be a built-in, but just didn\'t find out...

Answer 1

The range of floating point values is available in the sys.float_info object.

As Sven says, for CPython float is always 64-bit. But Python's language reference says

You are at the mercy of the underlying machine architecture (and C or Java implementation) for the accepted range ...".

So this is not necessarily the case for other Python implementations.