class_docstr: Class for reading from FASTA files containing a reference genome.
docstr: Returns whether the region is contained in this FASTA file.
docstr_tok: ["Returns","whether","the","region","is","contained","in","this","FASTA","file","."]
code: def is_valid(self, region):
      """Returns whether the region is contained in this FASTA file."""
      return self._reader.is_valid_interval(region)
  
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 4 for calling the IndexedFastaReader obj's underlying member method code with example usage: obj.is_valid(region) and returns: self