pyparsing.py 文件源码

def replaceWith(replStr):
    """
    Helper method for common parse actions that simply return a literal value.  Especially
    useful when used with C{L{transformString<ParserElement.transformString>}()}.

    Example::
        num = Word(nums).setParseAction(lambda toks: int(toks[0]))
        na = oneOf("N/A NA").setParseAction(replaceWith(math.nan))
        term = na | num

        OneOrMore(term).parseString("324 234 N/A 234") # -> [324, 234, nan, 234]
    """
    return lambda s,l,t: [replStr]