Linux import error

[蔡家麒]

I'm using Ubuntu 14.02

from qutip import *

Then comes error:

---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-1-674d9281af88> in <module>()
----> 1 from qutip import *

/home/caidish1234/anaconda3/lib/python3.6/site-packages/qutip/__init__.py in <module>()
    169 
    170 # core
--> 171 from qutip.qobj import *
    172 from qutip.states import *
    173 from qutip.operators import *

/home/caidish1234/anaconda3/lib/python3.6/site-packages/qutip/qobj.py in <module>()
     58 import qutip.settings as settings
     59 from qutip import __version__
---> 60 from qutip.fastsparse import fast_csr_matrix, fast_identity
     61 from qutip.cy.ptrace import _ptrace
     62 from qutip.permute import _permute

/home/caidish1234/anaconda3/lib/python3.6/site-packages/qutip/fastsparse.py in <module>()
    404 #Need to do some trailing imports here
    405 #-------------------------------------
--> 406 from qutip.cy.spmath import (zcsr_transpose, zcsr_adjoint, zcsr_mult)

ImportError: /home/caidish1234/anaconda3/lib/python3.6/site-packages/qutip/cy/spmath.cpython-36m-x86_64-linux-gnu.so: undefined symbol: _ZTINSt8ios_base7failureB5cxx11E

try it again,the error changes to:

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
/home/caidish1234/anaconda3/lib/python3.6/site-packages/qutip/__init__.py in <module>()
     46     __IPYTHON__
---> 47     qutip.settings.ipython = True
     48 except:

AttributeError: module 'qutip' has no attribute 'settings'

During handling of the above exception, another exception occurred:

AttributeError                            Traceback (most recent call last)
<ipython-input-2-674d9281af88> in <module>()
----> 1 from qutip import *

/home/caidish1234/anaconda3/lib/python3.6/site-packages/qutip/__init__.py in <module>()
     47     qutip.settings.ipython = True
     48 except:
---> 49     qutip.settings.ipython = False
     50 
     51 # -----------------------------------------------------------------------------

AttributeError: module 'qutip' has no attribute 'settings'

[蔡家麒]

I fixed this....just:

sudo apt-get install build-essential

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[Paul Nation]

It is more likely that you were running QuTiP from the installation directory.

-P

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