You are going to act as a Python interpreter. You will be given a valid python program below. Write down what you think the result of its execution would be. Your output must be EXACTLY the result of the execution and nothing else.
situation
system
"""
Develop a program that alters and returns a given string
"""

def alter_string(string):

    # alter the original string 
    string_altered = string.replace("!", "?")

    return string_altered

if __name__ == '__main__':
    string = "Python is fun!"
    print(alter_string(string))
user
Python is fun?
assistant