def price_oscillator(data, short_period, long_period):
catch_errors.check_for_period_error(data, short_period)<EOL>catch_errors.check_for_period_error(data, long_period)<EOL>ema_short = ema(data, short_period)<EOL>ema_long = ema(data, long_period)<EOL>po = ((ema_short - ema_long) / ema_long) * <NUM_LIT:100><EOL>return po<EOL>
Price Oscillator.

Formula:
(short EMA - long EMA / long EMA) * 100