Now I get my N-less "array".
So I probably shouldn't have followed my friends advice,
and I should just have written

    import my_friends_module


This is the correct way of doing things
 

Another solution could be, but don't know if it's safe enough

    from my_friends_module import *
    # and always as the last import do my own
    from scipy import array

Is this a good solution ?

No because when you'll want to use array, which array is it really ?
What is more, there can be border effects in your friend's module, there shouldn't be, but how to be sure ?

Matthieu