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我有一组内部调用其他 DTD 的 DTD。所有这些文件当前都存储在我项目的主目录中。我的项目开始看起来真的很堵塞，所以我希望将 DTD 移动到一个新文件夹中。我找到了一种方法来解析主文件的 DTD 路径，使用类似于此页面上的解析器。问题在于，尽管它正确解析了主 DTD 的路径，但它似乎两次解析了内部调用文件的路径。因为这个路径不存在，所以代码出错了。

我的解析器：

class DTDResolver(etree.Resolver):
    def resolve(self, system_url, public_id, context):
        print system_url
        newPath = "DTDs/" + system_url
        return self.resolve_filename(newPath, context)

结果：

us-patent-grant-v40-2004-12-02.dtd
DTDs/wipo.ent
Traceback (most recent call last):
  File "lxml.etree.pyx", line 3032, in lxml.etree.fromstring (src/lxml/lxml.etree.c:68121)
  File "parser.pxi", line 1786, in lxml.etree._parseMemoryDocument (src/lxml/lxml.etree.c:102470)
  File "parser.pxi", line 1674, in lxml.etree._parseDoc (src/lxml/lxml.etree.c:101299)
  File "parser.pxi", line 1074, in lxml.etree._BaseParser._parseDoc (src/lxml/lxml.etree.c:96481)
  File "parser.pxi", line 582, in lxml.etree._ParserContext._handleParseResultDoc (src/lxml/lxml.etree.c:91290)
  File "parser.pxi", line 683, in lxml.etree._handleParseResult (src/lxml/lxml.etree.c:92476)
  File "parser.pxi", line 622, in lxml.etree._raiseParseError (src/lxml/lxml.etree.c:91772)
lxml.etree.XMLSyntaxError: failed to load external entity "DTDs/DTDs/wipo.ent", line 237, column 7

我能够创建一个解决方法，但它看起来非常h​​acky所以我想知道是否有更好的方法来解决这个问题

class DTDResolver(etree.Resolver):
    def resolve(self, system_url, public_id, context):
        print system_url
        if system_url.startswith("DTDs/"):
            return self.resolve_filename(system_url, context)
        else:
            newPath = "DTDs/" + system_url
            return self.resolve_filename(newPath, context)
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