w3resource

NumPy: Replace a specific character with another in a given array of string values

NumPy String: Exercise-20 with Solution

Write a NumPy program to replace a specific character with another in a given array of string values.

Sample Solution:

Python Code:

import numpy as np 

str1 = np.array([['Python-NumPy-Exercises'],
              ['-Python-']])
print("Original array of string values:") 
print(str1)
print("\nReplace '-' with '=' character in the said array of string values:")
print(np.char.strip(np.char.replace(str1, '-', '==')))
print("\nReplace '-' with ' ' character in the said array of string values:")
print(np.char.strip(np.char.replace(str1, '-', ' ')))

Sample Output:

Original array of string values:
[['Python-NumPy-Exercises']
 ['-Python-']]

Replace '-' with '=' character in the said array of string values:
[['Python==NumPy==Exercises']
 ['==Python==']]

Replace '-' with ' ' character in the said array of string values:
[['Python NumPy Exercises']
 ['Python']]

Python Code Editor:

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

Previous: Write a NumPy program to add two zeros to the beginning of each element of a given array of string values.
Next: Write a NumPy program to count a given word in each row of a given array of string values.

What is the difficulty level of this exercise?

Test your Python skills with w3resource's quiz



Python: Tips of the Day

Getting the last element of a list:

some_list[-1] is the shortest and most Pythonic.

In fact, you can do much more with this syntax. The some_list[-n] syntax gets the nth-to-last element. So some_list[-1] gets the last element, some_list[-2] gets the second to last, etc, all the way down to some_list[-len(some_list)], which gives you the first element.

You can also set list elements in this way. For instance:

>>> some_list = [1, 2, 3]
>>> some_list[-1] = 5 # Set the last element
>>> some_list[-2] = 3 # Set the second to last element
>>> some_list
[1, 3, 5]

Note that getting a list item by index will raise an IndexError if the expected item doesn't exist. This means that some_list[-1] will raise an exception if some_list is empty, because an empty list can't have a last element.

Ref: https://bit.ly/3d8TfFP