maybe someone knows what I need add here to change line width?

mpf.plot(df4, type='candle', style='yahoo', volume=True, hlines=[12,4],  )

CodePudding user response：

Vertical and horizontal lines can be set in dictionary format. Line widths are specified in tuple format.

mpf.plot(df, 
         type='candle',
         style='yahoo',
         volume=True, 
         hlines=dict(hlines=[12,4], linewidths=(2,3.5)))