NameError: global name 'Qobj' is not defined

[pmor...@alumnos.unex.es]

Hi,
I get a weird error that I am not able to correct. I am running the file transmon.py and I get the error
Traceback (most recent call last):
  File "/home/trasmon.py", line 80, in <module>
    energies = array([hamiltonian(Ec, Ej, N, ng).eigenenergies() for ng in ng_vec])
  File "/home/trasmon.py", line 30, in hamiltonian
    return Qobj(m)
NameError: global name 'Qobj' is not defined
However if I try copy-pasting the code to console it will return no errors.
Any ideas how to solve this?
Thanks in advance

[Paul Nation]

Script works for me, so not sure.  If QuTiP was not installed, then it would fail at `from qutip import *`, however that is not the case. Moreover that import * loads the Qobj class so, it should be there.  Can you print the info from the qutip.about() function?

- P

[Pablo Antonio Moreno Casares]

---------- Forwarded message ----------
From: Pablo Antonio Moreno Casares <pmor...@alumnos.unex.es>
Date: 2017-01-01 12:06 GMT+01:00
Subject: Re: NameError: global name 'Qobj' is not defined
To: Paul Nation <nonher...@gmail.com>

Thanks Paul,

I added the line

qutip.about()

just before  calculating the energies, and I get the same kind of error:

Traceback (most recent call last):

  File "trasmon.py", line 82, in <module>
    qutip.about()
NameError: name 'qutip' is not defined

[Alex Pitchford]

You will either have to

import qutip

qutip.about()

or just call

about()

after your 

from qutip import *

I would suggest that you install anaconda python and then install the latest qutip from:

http://qutip.org/download.html

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