Re: [Pytables-users] problems with table.where()

[Francesc A. <fa...@py...>]

El dv 21 de 08 del 2009 a les 16:58 -0400, en/na DEMOLISHOR! the
Demolishor va escriure:
> Hello folks,
>   I've been happily using PyTables for a month or two now, but I've
> run into a pretty weird problem. I have attached a PyTables file that
> has a table with a single row of data from an analysis I am doing. I
> run this script:
> 
> 
> #!/usr/bin/env python
> 
> import sys
> 
> import tables
> 
> fp = tables.openFile('ev697158.h5', mode='r')
> 
> print "nrow = ", len(fp.root.nt)
> print "t = ", fp.root.nt[0]['t']
> 
> cut1 = '1 and (t > -0.4) and (sin(pip1_theta) < 0.5) and
> (sin(pip2_theta) < 0.5)'
> cut2 = '1 and (t > -0.4)'

You are using the 'and' operator and this cannot be overloaded in Python
(at least Python 2.x series).  Use the '&' operator instead.  Please,
refer to the condition syntax appendix of PyTables User's Guide:

http://www.pytables.org/docs/manual/apb.html

and be sure you understand it before to proceed further with cut
expressions.

HTH,

Francesc