[Tutor] (no subject)

Daniel Yoo dyoo@hkn.EECS.Berkeley.EDU
Wed, 30 Aug 2000 19:19:51 -0700 (PDT)

>     Here is a question in the python munual 3.1.3.
>     The example said:
>     a = ['spam', 'eggs', 100, 1234];
>     a[0]='spam',a[1]='eggs',a[2]=100 and a[4]=1234;
>     It then said:
>     a[0:2]=[1,12]
>     I think it's a error assignment.
>     'Cause I believe a[0:2]=['spam','eggs',100];
>     Why? 

When you try something like:


this will take a[0] and a[1].  It's a little weird at first, but it
actually simplifies program logic that works with arrays.  You'll need to
write a few programs, though, before it makes sense.

The '[]' operator will make a slice starting at the left element, all the
way up to, but not including, the right element.

Oh, also,


is the same thing as a[0:2], and can be read as "take the first 2 elements
of 'a'".

If you're curious, the range() function has similar behavior:

>>> range(0)
>>> range(1)
>>> range(2)
[0, 1]