Backtrader Event Driven

WHENWhen implementing a CSV data feed

ACTIONoverride _loadline method to parse tokens into OHLCV values

CONSEQUENCECSV data feed will fail to parse any market data because _loadline is the only hook for subclasses to implement token-to-value conversion, causing the entire backtest to receive no price data

WHENWhen parsing datetime strings from CSV

ACTIONuse the exact dtformat parameter matching the source file format

CONSEQUENCEDatetime parsing will raise ValueError at runtime when the format string doesn't match the actual date format in the CSV file, causing data loading to fail silently or crash the entire backtest

WHENWhen configuring data feed column indices

ACTIONverify CSV column indices match the actual column positions in the file

CONSEQUENCEOHLCV values will be assigned to wrong lines or raise IndexError when column indices don't align with the actual CSV structure, producing garbage data in indicators and trading signals