Array slicing in NumPy allows you to extract a portion of an array instead of accessing a single element. 

Slicing Syntax :
Python 
array[start : stop : step]

  • start → index to begin (inclusive)
  • stop → index to end (exclusive)
  • step → step size (optional)

If omitted:

  • start defaults to 0
  • stop defaults to end of array
  • step defaults to 1

Slicing a 1D Array :

Python 
import numpy as np arr = np.array([10, 20, 30, 40, 50]) print(arr[1:4]) #output
[20 30 40] 


Slicing with Step :
Python 
import numpy as np arr = np.array([10, 20, 30, 40, 50]) print(arr[0:5:2]) #output [10 30 50]

Slicing a 2D Array :
Python 
import numpy as np arr = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]]) print(arr[0:2]) #output [[1 2 3] [4 5 6]]
Python 
import numpy as np arr = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]]) print(arr[0:2, 0:2]) #output [[1 2] [4 5]]