convert double to float in Python

Question

In a Python program, I have these two values:

v1 = 0.00582811585976
v2 = 0.00582811608911

My hypothesis is that v1 is a 64-bits floating point value, and v2 is v1 converted to a 32-bits floating point value. How can I verify this?

Details:
The first value comes from a hardware board that calculates with 64-bits precision. The board sends the value to a PC, but it should also convert the value to 32-bits precision and send that to another board, which in turn sends it to a PC. I just want to verify that this is really happening and all I have are two large arrays of numbers.

Answer 1

You can use the struct module to play with numerical representations:

import struct

>>> struct.unpack("f", struct.pack("f", 0.00582811585976))
(0.005828116089105606,)