def bb_range(data, period, std=<NUM_LIT>):
catch_errors.check_for_period_error(data, period)<EOL>period = int(period)<EOL>bb_range = (upper_bollinger_band(data, period, std) -<EOL>lower_bollinger_band(data, period, std)<EOL>)<EOL>return bb_range<EOL>
Range.

Formula:
bb_range = u_bb - l_bb