Find the length of each string element in the Numpy array Last Updated : 02 Jan, 2023 Summarize Comments Improve Suggest changes Share Like Article Like Report NumPy builds on (and is a successor to) the successful Numeric array object. Its goal is to create the corner-stone for a useful environment for scientific computing. NumPy provides two fundamental objects: an N-dimensional array object (ndarray) and a universal function object (ufunc). In this post we are going to discuss ways in which we can find the length of each string element in the given numpy array. Problem #1 : Given a numpy array whose underlying data is of string type. Find the length of each element in the given object. Solution : We are going to use numpy.vectorize() function to find the length of each element in the given numpy array object. Python3 # importing the numpy library as np import numpy as np # Create a numpy array arr = np.array(['New York', 'Lisbon', 'Beijing', 'Quebec']) # Print the array print(arr) Output : Now we will use numpy.vectorize() function to find the length of each element in the given numpy array object. Python3 # Use vectorize function of numpy length_checker = np.vectorize(len) # Find the length of each element arr_len = length_checker(arr) # Print the length of each element print(arr_len) Output : As we can see in the output, we have successfully calculated the length of each string element in the given numpy array object. Problem #2 : Given a numpy array whose underlying data is of string type. Find the length of each element in the given object. Solution : We are going to use List comprehension technique to find the length of each element in the given numpy array object. Python3 # importing the numpy library as np import numpy as np # Create a numpy array arr = np.array(['New York', 'Lisbon', 'Beijing', 'Quebec']) # Print the array print(arr) Output : Now we will use List comprehension technique to find the length of each element in the given numpy array object. Python3 # Find the length of each element arr_len = [len(i) for i in arr] # Print the length of each element print(arr_len) Output : As we can see in the output, we have successfully calculated the length of each string element in the given numpy array object. One additional approach to finding the length of each element in a NumPy array is to use the NumPy function numpy.char.str_len. This function takes a NumPy array of strings as input and returns an array of the lengths of each string. For example: Python3 import numpy as np # Create a numpy array arr = np.array(['New York', 'Lisbon', 'Beijing', 'Quebec']) # Find the length of each element arr_len = np.char.str_len(arr) # Print the length of each element print(arr_len) #This code is contributed by Edula Vinay Kumar Reddy This will output: [8 7 7 6] (This code wont work in gfg compiler , install numpy in your local compiler then check ) Comment More infoAdvertise with us Next Article Find the length of each string element in the Numpy array S Shubham__Ranjan Follow Improve Article Tags : Numpy Python-numpy Python numpy-arrayManipulation AI-ML-DS With Python Similar Reads Linear Regression in Machine learning Linear regression is a type of supervised machine-learning algorithm that learns from the labelled datasets and maps the data points with most optimized linear functions which can be used for prediction on new datasets. 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