| import re | |
| from typing import Match, Pattern | |
| def camel_to_snake( | |
| name: str, _re_snake: Pattern[str] = re.compile("[a-z][A-Z]") | |
| ) -> str: | |
| """Convert name from CamelCase to snake_case. | |
| Args: | |
| name (str): A symbol name, such as a class name. | |
| Returns: | |
| str: Name in camel case. | |
| """ | |
| def repl(match: Match[str]) -> str: | |
| lower: str | |
| upper: str | |
| lower, upper = match.group() # type: ignore | |
| return f"{lower}_{upper.lower()}" | |
| return _re_snake.sub(repl, name).lower() | |
| if __name__ == "__main__": | |
| print(camel_to_snake("HelloWorldEvent")) | |