To return the lowest index in the string where substring sub is found, use the numpy.char.find() method in Python Numpy. The method returns the output array of ints. Returns -1 if sub is not found. The first parameter is the input array. The second parameter is the substring to be searched
Steps
At first, import the required library −
import numpy as np
Create a One-Dimensional array of strings −
arr = np.array(['KATIE', 'JOHN', 'KATE', 'AmY', 'BRADley'])
Displaying our array −
print("Array...\n",arr)
Get the datatype −
print("\nArray datatype...\n",arr.dtype)
Get the dimensions of the Array −
print("\nArray Dimensions...\n",arr.ndim)
Get the shape of the Array −
print("\nOur Array Shape...\n",arr.shape)
Get the number of elements of the Array −
print("\nNumber of elements in the Array...\n",arr.size)
To return the lowest index in the string where substring sub is found, use the numpy.char.find() method −
print("\nResult (find)...\n",np.char.find(arr, 'AT'))
Example
import numpy as np # Create a One-Dimensional array of strings arr = np.array(['KATIE', 'JOHN', 'KATE', 'AmY', 'BRADley']) # Displaying our array print("Array...\n",arr) # Get the datatype print("\nArray datatype...\n",arr.dtype) # Get the dimensions of the Array print("\nArray Dimensions...\n",arr.ndim) # Get the shape of the Array print("\nOur Array Shape...\n",arr.shape) # Get the number of elements of the Array print("\nNumber of elements in the Array...\n",arr.size) # To return the lowest index in the string where substring sub is found, use the numpy.char.find() method in Python Numpy # The method returns the output array of ints. Returns -1 if sub is not found. # The first parameter is the input array # The second parameter is the substring to be searched print("\nResult (find)...\n",np.char.find(arr, 'AT'))
Output
Array... ['KATIE' 'JOHN' 'KATE' 'AmY' 'BRADley'] Array datatype... <U7 Array Dimensions... 1 Our Array Shape... (5,) Number of elements in the Array... 5 Result (find)... [ 1 -1 1 -1 -1]