It’s a common pattern in templating: return one chunk of HTML most of the time, but under certain conditions, return a different chunk.

Thus, conditionals are a common part of templating. They’re also a common part of Python f-strings, because…well, Python has conditionals. Here’s a simple example using a Python “ternary”:

def main() -> str:
    """Main entry point."""
    message = "Say Howdy"
    not_message = "So Sad"
    show_message = True
    result = render(
        {message if show_message else not_message}
    return result