market_variables.py 文件源码

def __new__(cls,
                name,
                expr,
                replace = False):
        # code
        efound = expr in [Variable.variables[key].expr for key in Variable.variables]
        if efound:
            key = [key for key in Variable.variables if expr in Variable.variables[key].expr]
            logger.info("Expression '%s' already exists for key %s", expr, key)
            return
        else:
            if replace or not name in Variable.variables:
                if not valid_name(name):
                    logger.info("Invalid variable key: %s", name)
                    return
                try:
                    result = parser.expr(expr)
                except:
                    logger.info("Invalid expression: %s", expr)
                    return
                return super(Variable, cls).__new__(cls)
            else:
                logger.info("Key %s already exists", name)

    # function __init__