How to distinguish different types of NaN float in Python

Question

I\'m writing Python 2.6 code that interfaces with NI TestStand 4.2 via COM in Windows. I want to make a \"NAN\" value for a variable, but if I pass it float(\'nan\')

Answer 1

John Cook had a nice post on this that might be helpful:

• IEEE floating point arithmetic in Python

Update: won't this work?

In [144]: import scipy

In [145]: scipy.nan
Out[145]: 1.#QNAN

In [146]: scipy.inf
Out[146]: 1.#INF

In [147]: scipy.inf * 0
Out[147]: -1.#IND