Function should_warn

traitlets/utils/warnings.py:51–64

Add our own checks for too many deprecation warnings. Limit to once per package.

(key: t.Any)

def should_warn(key: t.Any) -> bool:
    """Add our own checks for too many deprecation warnings.

    Limit to once per package.
    """
    env_flag = os.environ.get("TRAITLETS_ALL_DEPRECATIONS")
    if env_flag and env_flag != "0":
        return True

    if key not in _deprecations_shown:
        _deprecations_shown.add(key)
        return True
    else:
        return False