[Tutor] When is = a copy and when is it an alias

[Denis Heidtmann]

Running python 2.7 in linux

Below are two extremes.  Can I get some guidance on this?

Thanks,
-Denis H

>>> a=zeros((2,3),dtype=int)
>>> b=a
>>> a[:,0]=[1,2]
>>> a
array([[1, 0, 0],
       [2, 0, 0]])
>>> b
array([[1, 0, 0],
       [2, 0, 0]])
>>> a=2
>>> a
2
>>> b
array([[1, 0, 0],
       [2, 0, 0]])

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