值错误：ParentedTree.read文件（）：应为“endofstring”，但得到“（：”

Question

下面是调试我遇到的错误的分步代码：

from nltk.tree import ParentedTree

teststr = 'a) Any service and handling fee imposed on customers by Used Motor Vehicle Dealers subject to these Rules: \r\n        1) shall be charged uniformly to all retail customers; \r\n        2) may not be presented as mandatory in writing, electronically, verbally, via American Sign Language, or via other media as mandatory; nor presented as mandatory or mandated by any entity, other than the Arkansas Used Motor Vehicle Dealer who or dealership which is legally permitted to invoice, charge and collect the service and handling fee established by these Rules; \r\n        3) must follow the procedures for disclosure set out by these Rules.'

#Using ALLENNLP's parser
from allennlp.predictors.predictor import Predictor
conspredictor = Predictor.from_path("https://s3-us-west-2.amazonaws.com/allennlp/models/elmo-constituency-parser-2018.03.14.tar.gz")


treestr = conspredictor.predict(sentence=teststr)['trees']

ptree = ParentedTree.fromstring(treestr)

以下是我收到的回溯错误：

<ipython-input-391-f600cbe3ff5e> in <module>

         10 treestr = conspredictor.predict(sentence=teststr)['trees']
         11 
    ---> 12 ptree = ParentedTree.fromstring(treestr)

~\AppData\Local\Continuum\anaconda3\lib\site-packages\nltk\tree.py in fromstring(cls, s, brackets, read_node, read_leaf, node_pattern, leaf_pattern, remove_empty_top_bracketing)

        616             if token[0] == open_b:
        617                 if len(stack) == 1 and len(stack[0][1]) > 0:
    --> 618                     cls._parse_error(s, match, 'end-of-string')
        619                 label = token[1:].lstrip()
        620                 if read_node is not None: label = read_node(label)

~\AppData\Local\Continuum\anaconda3\lib\site-packages\nltk\tree.py in _parse_error(cls, s, match, expecting)

        677             offset = 13
        678         msg += '\n%s"%s"\n%s^' % (' '*16, s, ' '*(17+offset))
    --> 679         raise ValueError(msg)
        680 
        681     #////////////////////////////////////////////////////////////

ValueError: ParentedTree.read(): expected 'end-of-string' but got '(:'
            at index 273.
                "...es))))))) (: :) (S (..."
                              ^