change dimensions of array python code example

Example 1: change type of array python

arr=arr.astype('uint8')

Example 2: size array python

size = len(myList)

Example 3: how to create an array in python

array = ["1st", "2nd", "3rd"]
#prints: ['1st', '2nd', '3rd']
array.append("4th")
#prints: ['1st', '2nd', '3rd', '4th']