How to Insert a Space between Characters of all the Elements of a given NumPy Array

NumPy provides function np.char.join(), which joins characters of a string using a specified separator.

import numpy as np
arr = np.array(["Hello"])
res = np.char.join(" ", arr)
print(res)

['H e l l o']

Syntax

np.char.join(sep, arr)

Parameters:

• sep: separator to insert between characters.
• arr: Input array of strings.

Return Value: Returns a new array where each string has its characters joined by the separator.

Examples

Example 1: In this example, we insert spaces between the characters of each string in the array.

import numpy as np
arr = np.array(["Geeks", "For", "Geeks"])
res = np.char.join(" ", arr)
print(res)

['G e e k s' 'F o r' 'G e e k s']

Example 2: This example shows how we can use a different separator to join characters.

import numpy as np
arr = np.array(["Data", "Science"])
res = np.char.join("-", arr)
print(res)

['D-a-t-a' 'S-c-i-e-n-c-e']

Example 3: Here, we format numeric strings by adding spaces between digits.

import numpy as np
arr = np.array(["1234", "5678"])
res = np.char.join(" ", arr)
print(res)