Whitespace includes spaces, tabs, and newlines. You can remove all of them using a list comprehension or the replace() method.

Code Example:

def remove_whitespace(s):
    return ''.join([c for c in s if c not in (' ', '\t', '\n')])

# Example usage
text = "Hello\tworld!\n How are you?"
print(remove_whitespace(text))  # Output: "Helloworld!Howareyou?"

This function iterates through each character in the string and joins together only those that are not whitespace.