Denis Heidtmann wrote: > Running python 2.7 in linux > > Below are two extremes. Can I get some guidance on this?
>>>> 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]]) In short: x = ... binds a name, it never copies. On the other side x[whatever] = ... or x.attr = ... can run arbitrary code that may or may not alter the object bound to x inplace. You have to know the type of x to know what happens. _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
