class Copy:
    def __init__(self, source: str, target: str, replace = False):
        self.source = source
        self.target = target
        self.replace = replace

    def execute_on_row(self, row=dict[str, str], source_col=None):
        return {
            **({} if not self.replace else {self.source_col: ""}),
            self.target: row[self.source].value
        }