NumPy: Insert a space between characters of all the elements of a given array

Last update on April 29 2025 12:55:25 (UTC/GMT +8 hours)

5. Insert Spaces Between Characters

Write a NumPy program to insert a space between characters of all the elements of a given array.

Sample Solution:-

Python Code:

# Importing necessary library
import numpy as np

# Creating a NumPy array containing strings
x = np.array(['python exercises', 'PHP', 'java', 'C++'], dtype=np.str)

# Displaying the original array
print("Original Array:")
print(x)

# Using np.char.join to join elements of the array with a space character
r = np.char.join(" ", x)

# Displaying the result after joining elements with a space
print(r)

Sample Input:

(['python exercises', 'PHP', 'java', 'C++'], dtype=np.str)

Sample Output:

Original Array:
['python exercises' 'PHP' 'java' 'C++']
['p y t h o n   e x e r c i s e s' 'P H P' 'j a v a' 'C + +']

Explanation:

In the above exercise –

x1 = np.array(['python exercises', 'PHP', 'java', 'C++'], dtype=np.str): This line creates a 1-dimensional NumPy array x1 with 4 elements of string data type. The elements are ' python exercises ', 'PHP', 'Java', and 'C++'.

r = np.char.join(" ", x):

In the above code –

The np.char.join() method takes two arguments:
The first argument is the string to be used as a separator while joining the elements of the input array.
The second argument is the array of strings to be joined.
In this case, the separator used is a space character (" ") and the array of strings to be joined is 'x'.
The resulting string after joining the elements of the input array is stored in the variable 'r'.

Pictorial Presentation:

NumPy String: Insert a space between characters of all the elements of a given array

For more Practice: Solve these Related Problems:

Create a function that inserts a customizable separator (e.g., a space) between every character of each string in an array.
Implement an approach that interleaves a fixed string between each pair of characters using np.char.join.
Test the insertion on an array of words and then reassemble the words to verify the insertion process.
Combine the space insertion with a case transformation to modify the string’s appearance further.

Go to:

Previous: Write a NumPy program to make the length of each element 15 of a given array and the string centered / left-justified / right-justified with paddings of _.
Next: Write a NumPy program to encode all the elements of a given array in cp500 and decode it again.

Python-Numpy Code Editor:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.