Re: [jupyter] scipy in a jupyter console
MinRK
On Tue, Aug 9, 2016 at 4:48 PM, Thomas Haslwanter <thomas.h...@gmail.com> wrote:
Hi,
I am somewhat stuped about the behavior of scipy in a jupyter console:
The following code runs properly as a python program:
import scipy as sp
print(sp.constants.g)
But the same code produces an
AttributeError: module 'scipy' has no attribute 'constants'
when run in a QtConsole, or a Jupyter Notebook.
My setup:
Jupyter QtConsole 4.2.1
Python 3.5.2
Win10
jupyter 1.0.0
jupyter-console 5.0.0
ipython 5.0.0
Can anyone explain why the behavior in the jupyter notebook/qtconsole is different than in a python module?
In a standalone script with only those two lines, it raises the attribute error on constants that you see interactively. I’m guessing when you are using it in a program, some other part of your code is causing scipy.constants to be imported, either directly or indirectly.
The key here is that scipy.constants isn’t a regular attribute of the scipy module, it is itself a module. In general, modules do not have their submodules available as attributes until those submodules have been imported. Once they have been imported (anywhere), then the submodule will be available as an attribute on its parent.
Try the following script:
import scipy
print('constants immediately?', hasattr(scipy, 'constants'))
from scipy.constants import g
print('after constants import?', hasattr(scipy, 'constants'))
And scipy.constants would be defined if any code had imported scipy.constants at any time during the program, not just in your current script.
So in general, if you want scipy.constants, you should import scipy.constants or from scipy import constants.
-MinRK
Thanks, thomas--
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