class_docstr: Class for reading from unindexed FASTA files.
docstr: Returns the base pairs (as a string) in the given region.
docstr_tok: ["Returns","the","base","pairs","(","as","a","string",")","in","the","given","region","."]
code: def query(self, region):
      """Returns the base pairs (as a string) in the given region."""
      raise NotImplementedError("Can not query an unindexed FASTA file")
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import collections
  import six
  from etils import epath
  from third_party.nucleus.io import genomics_reader
  from third_party.nucleus.io.python import reference
  from third_party.nucleus.protos import fasta_pb2
  from third_party.nucleus.protos import reference_pb2
  from third_party.nucleus.util import ranges
label_desc: Use image node_id 3 for calling the UnindexedFastaReader obj's underlying member method code with example usage: obj.query(region) without return types