How does Python's slice notation work? That is: when I write code like a[x:y:z], a[:], a[::2] etc., how can I understand which elements end up in the slice? Please include references where appropriate.

_{See Why are Python's slice and range upper-bound exclusive? to learn why xs[0:2] == [xs[0], xs[1]], i.e. no xs[2].
See Make a new list containing every Nth item in the original list for xs[::N].
See How does assignment work with list slices? to learn what xs[0:2] = [4, 5] does.}

How does Python's slice notation work? That is: when I write code like a[x:y:z], a[:], a[::2] etc., how can I understand which elements end up in the slice?

_{See Why are Python's slice and range upper-bound exclusive? to learn why xs[0:2] == [xs[0], xs[1]], not [..., xs[2]].
See Make a new list containing every Nth item in the original list for xs[::N].
See How does assignment work with list slices? to learn what xs[0:2] = ["a", "b"] does.}

How does Python's slice notation work? That is: when I write code like a[x:y:z], a[:], a[::2] etc., how can I understand which elements end up in the slice? Please include references where appropriate.

_{See Why are Python's slice and range upper-bound exclusive? for more discussion of the design decisions behind the notation.}

 _{See Make a new list containing every Nth item in the original list for the most common practical usage of slicing (and other ways to solve the problem): getting every Nth element of a list. Please use that question instead as a duplicate target where appropriate.}

 _{For more specific answers about slice assignment, see How does assignment work with list slices? (although this is also addressed here).}

How does Python's slice notation work? That is: when I write code like a[x:y:z], a[:], a[::2] etc., how can I understand which elements end up in the slice? Please include references where appropriate.

_{See Why are Python's slice and range upper-bound exclusive? to learn why xs[0:2] == [xs[0], xs[1]], i.e. no xs[2]. 
See Make a new list containing every Nth item in the original list for xs[::N]. 
See How does assignment work with list slices? to learn what xs[0:2] = [4, 5] does.}

How does Python's slice notation work? That is: when I write code like a[x:y:z], a[:], a[::2] etc., how can I understand which elements end up in the slice? Please include references where appropriate.

_{See Why are Python's slice and range upper-bound exclusive? for more discussion of the design decisions behind the notation.}

_{See Make a new list containing every Nth item in the original list for the most common practical usage of slicing (and other ways to solve the problem): getting every Nth element of a list. Please use that question instead as a duplicate target where appropriate.}

_{For more specific answers about slice assignment, see How does assignment work with list slices? (although this is also addressed here).}

How does Python's slice notation work? That is: when I write code like a[x:y:z], a[:], a[::2] etc., how can I understand which elements end up in the slice? Please include references where appropriate.

_{See Why are Python's slice and range upper-bound exclusive? for more discussion of the design decisions behind the notation.}

_{See Make a new list containing every Nth item in the original list for the most common practical usage of slicing (and other ways to solve the problem): getting every Nth element of a list. Please use that question instead as a duplicate target where appropriate.}

_{For more specific answers about slice assignment, see How does assignment work with list slices? (although this is also addressed here).}