The DevilStra strategy is a trading strategy implemented as a class that inherits from the IStrategy class. This strategy aims to generate buy and sell signals based on a set of conditions. In the populate_indicators method, the strategy doesn't make any modifications to the input dataframe and simply returns it as is.
The populate_buy_trend method is responsible for populating the buy signals in the dataframe.
It retrieves the current whitelist of pairs and determines the index of the current pair being processed.
It then checks the length of the buy spells (a list of parameters) and compares it to the length of the whitelist. If the whitelist is longer, it displays a message indicating that the strategy needs to be re-optimized and exits the program. Next, it retrieves the specific buy parameters for the current pair from the buy spells list. It then generates a set of conditions based on the buy indicators, crossed indicators, operators, and real numbers specified in the parameters. These conditions are appended to a list. Finally, if there are any conditions, the corresponding rows in the dataframe are marked with a value of 1 in the 'buy' column. The populate_sell_trend method follows a similar process as the populate_buy_trend method, but it generates sell signals based on sell parameters instead. Overall, the DevilStra strategy analyzes various indicators and conditions to determine when to generate buy and sell signals for a given trading pair.