OptionalcloseOptionalhighHigh column. Default 'high'.
OptionallowLow column. Default 'low'.
OptionalmaWhich moving average smooths the per-bar ratio — any of the shared
MaType menu. Only meaningful with period, and passing it
without one throws rather than silently doing nothing.
OptionalopenOpen column. Default 'open'.
OptionaloutputName of the appended column. Default 'bop'.
OptionalperiodOptional smoothing length in bars. Omitted by default — the
study is TA-Lib's raw per-bar BOP unless this is set. See the
docstring's "one indicator, two conventions" note.
Close column. Default
'close'.