class_docstr: Class to hold the matrix type.
class_docstr_tok: ["Class","to","hold","the","matrix","type","."]
code: def fortran_format(self):
      return (
          self._q2f_type[self.value_type]
          + self._q2f_structure[self.structure]
          + self._q2f_storage[self.storage]
      )
  
imports: import warnings
  import numpy
  from scipy.sparse import csc_matrix
  from scipy.io.harwell_boeing._fortran_format_parser import FortranFormatParser, IntFormat, ExpFormat
label_desc: Use image node_id 3 for calling the HBMatrixType obj's underlying member method code with example usage: obj.fortran_format() and returns: unknown