Slicing Elements of Array
This is supposed to be a concise tutorial and you should not spend longer than 10 minutes to go through it.
Idea
Idea
L = range(10)>> L = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]We can slice as L[startAt:endBefore:skip] where indices live BETWEEN elements.
Example 1: Suppose we want every 3rd element.
Example 1: Suppose we want every 3rd element.
L[::3]>> L = [0, 3, 6, 9]Example 2: Suppose we want every 3rd element, starting from the first one
Example 2: Suppose we want every 3rd element, starting from the first one
L[1::3]>> L = [1, 4, 7]Example 3: Suppose we want every 3rd element, starting from the second one
Example 3: Suppose we want every 3rd element, starting from the second one
L[2::3]>> L = [2, 5, 8]Example 4: We can specify a negative step to go backwards
Example 4: We can specify a negative step to go backwards
L[::-1]>> L = [9, 8, 7, 6, 5, 4, 3, 2, 1, 0]Example 5: We can delete every 3rd element
Example 5: We can delete every 3rd element
del L[::3]>> L = [1, 2, 4, 5, 7, 8]References
References
This tutorial is summarized and is revised from:
Other blogged posts >> Tutorials