File size: 610 Bytes
5b76e0f | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | 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"))
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