[SciPy-user] "in" vs. looped "=="

[R. Padraic Springuel]

I have some code that uses a "1. in x" statement early on, where x is a 
rank-1 ndarray with dtype=float.  This statement returns False and the 
program continues accordingly.  However, later on in the same code I 
loop over the elements of x and the statement "x[i] == 1" is evaluated 
and comes back as True for some elements of x.  To my mind, that 
shouldn't be happening.  Is there a difference in how "1. in x" (i.e. 
the __contains__ method of ndarray) and "x[i] == 1." (i.e. the __eq__ 
property of float) behave that I'm not aware of?
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R. Padraic Springuel
Research Assistant
Department of Physics and Astronomy
University of Maine
Bennett 309
Office Hours: By appointment only