Python slice(start:stop[:step])

slice(start:stop[:step]) is an object usually containing a portion of a sequence. A slice is created using the subscript notation, [] with colons between numbers when several are given, such as in variable_name[1:3:5].

Arguments

This function can be used to slice tuples, arrays and lists.

The value of the start parameter (or None if not provided)

The value of the stop parameter (or last index of sequence)

The value of the step parameter (or None if not provided). It cannot be 0.

All three must be of integer type.

Return

If only stop is provided, it generates portion of sequence from index 0 till stop.

If only start is provided, it generates portion of sequence after index start till last element.

If both start and stop are provided, it generates portion of sequence after index start till stop.

If all three start, stop and step are provided, it generates portion of sequence after index start till stop with increment of index step.

Example

a = [ 1, 2, 3, 4, 5, 6, 7, 8]
print(a[:5])    # prints [1, 2, 3, 4, 5]
print(a[2:])    # prints [3, 4, 5, 6, 7, 8]
print(a[2:5])    # prints [3, 4, 5]
print(a[2:7:2])    # prints [3, 5, 7]

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