Write a Python program to replace whitespaces with an underscore and vice versa.

Here’s a Python program that replaces whitespaces with an underscore and vice versa:

def replace_whitespaces(string):
    # Replace spaces with underscores and underscores with spaces
    new_string = ''
    for char in string:
        if char == ' ':
            new_string += '_'
        elif char == '_':
            new_string += ' '
        else:
            new_string += char
    return new_string

# Example usage
input_string = "Hello World_this is a_test"
result = replace_whitespaces(input_string)
print(result)  # Output: Hello_World this is a test

Explanation

• The function replace_whitespaces iterates through each character in the input string.
• It checks if the character is a space; if so, it replaces it with an underscore.
• If the character is an underscore, it replaces it with a space.
• Other characters remain unchanged.
• Finally, the modified string is returned.