NumPy count() function

The count() function is used to return an array with the count values of non-overlapping occurrences(unique) of a given substring in the range [start, end].

This function calls str.count internally, for every element of the given ndrray.

Syntax of count():

The syntax required to use this method is as follows:

numpy.char.count(a, sub, start, end=None)

Let’s cover the parameters of the count() function:


let us now take a look at the parameters of this function:

  • a It can either be an input array or an input string.
  • sub This is a required parameter indicating the substring to search from the input string or the input array.
  • start, end These parameters are optional, both start and end are used to set the boundary within which the substring is to be searched.

Returned Values:

The count() function will return an integer array with the number of non-overlapping occurrences of the substring.

Basic Example of count() function:

The code snippet is as follows where we will use count() function:

import numpy as np

str1 = np.array(['ooooaaaaqqqk','ccccvvvvvaaaao','ggghhhjjjsskkka'])
print("The original string is:\n",str1)
print("\nThe count of 'a' in str1")

y = np.char.count(str1,'a')
print("\nThe count of 'k' in st1:")

z = np.char.count(str1,'k')
print("\nThe count of 'o' in st1:")

x = np.char.count(str1,'o')


using count() function of Numpy
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