class_docstr: Class for reading from unindexed FASTA files.
docstr: Returns a ContigInfo proto for contig_name.
docstr_tok: ["Returns","a","ContigInfo","proto","for","contig_name","."]
code: def contig(self, contig_name):
      """Returns a ContigInfo proto for contig_name."""
      raise NotImplementedError(
          "Contigs unknown for 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 5 for calling the UnindexedFastaReader obj's underlying member method code with example usage: obj.contig(contig_name) without return types