numpy.index() in Python
numpy.core.defchararray.index(arr, substring, start=0, end=None): Finds the lowest index of the sub-string in the specified range But if substring is not found, it raises ValueError.
Parameters:
arr : array-like or string to be searched.
substring : substring to search for.
start, end : [int, optional] Range to search in.Returns : An integer array with the lowest index of found sub-string, raises ValueError if substring is not found.
Code #1:
# Python Program illustrating # numpy.char.index() method import numpy as np arr = ['this is geeks for geek'] print ("arr : ", arr) print ("\nindex of 'geeks' : ", np.char.index(arr, 'geeks')) |
Output:
arr : ['this is geeks for geek'] index of 'geeks' : [8]
Code #2:
# Python Program illustrating # numpy.char.index() method import numpy as np arr = ['this is geeks for geek'] print ("\nindex of 'geeks' : ", np.char.index(arr, 'geeks', start = 2))print ("\nindex of 'geeks' : ", np.char.index(arr, 'geeks', start = 10))print ("\nindex of 'geek' : ", np.char.index(arr, 'geek', start = 10)) |
Output:
index of 'geeks' : [8] ValueError: substring not found index of 'geek' : [18]
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