Observe (using sage 4.5.2 on my mac):

sage: import numpy
sage: a = numpy.array([1,2,3])
sage: v = vector(a)

Traceback (click to the left of this block for traceback)
...
TypeError: unsupported operand type(s) for ** or pow(): 'NoneType' and
'int'

The error message is particularly weird.

Victor

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