Traceback (most recent call last): File "main.py", line 10, in <module> File "main.py", line 4, in say_to_all TypeError: 'NoneType' object is not iterable

This error occurs because you are trying to iterate over a variable that is of type None. In Python, None is a special constant that represents the absence of a value.

To fix this error, you need to make sure that the variable you are trying to iterate over is not None. You can do this by checking if the variable is not None before trying to iterate over it.

Here is an example of how you can modify your code to avoid this error:

def say_to_all(messages):
    if messages is not None:
        for message in messages:
            print(message)

messages = None
say_to_all(messages)

By adding the check if messages is not None:, you ensure that the code inside the loop will only execute if messages is not None. This will prevent the "TypeError: 'NoneType' object is not iterable" from occurring.