Function patch

backtesting/_util.py:34–44

(obj, attr, newvalue)

@contextmanager
def patch(obj, attr, newvalue):
    had_attr = hasattr(obj, attr)
    orig_value = getattr(obj, attr, None)
    setattr(obj, attr, newvalue)
    try:
        yield
    finally:
        if had_attr:
            setattr(obj, attr, orig_value)
        else:
            delattr(obj, attr)


def _as_str(value) -> str: