[yt-users] Test for field

[Elizabeth Tasker]

Hi,

I want to test if a data set at particles. I thought:

pf.has_key("particle_type")

would work, but oddly it doesn't since:

In [17]: pf.has_key("particle_type")
Out[17]: False

yet:

In [4]: dd = pf.h.all_data()
In [5]: dd["particle_type"]
yt : [INFO     ] 2013-02-23 17:00:43,826 Getting particle_type using ParticleIO
Out[5]: array([11, 11, 11, ..., 11, 11, 11])


Shouldn't  pf.has_key("particle_type") be true in this case?

Elizabeth