[Tutor] range() help

Jan Erik Moström lists at mostrom.pp.se
Tue Apr 17 13:57:18 CEST 2007

Reply to python at uni-code.com 07-04-17 07:42:

>How come it prints on -40 or -70.
>Does -70 come from -70 -> -100?
>This is really confusing me.

I don't really understand your question, the definition of range

     range([start,] stop[, step]) -> list of integers

     Return a list containing an arithmetic progression of integers.
     range(i, j) returns [i, i+1, i+2, ..., j-1]; start (!) 
defaults to 0.
     When step is given, it specifies the increment (or decrement).
     For example, range(4) returns [0, 1, 2, 3].  The end point 
is omitted!
     These are exactly the valid indices for a list of 4 elements.

So you are basically telling python to start from -10, and then 
subtract -30 until it reaches -100.

More information about the Tutor mailing list