docstr: Convert input to appropriate format for cat12
docstr_tok: ["Convert","input","to","appropriate","format","for","cat12"]
code: def __str__(self):
      """Convert input to appropriate format for cat12"""
      return "{%s}" % self.to_string()
  
imports: import os
  from pathlib import Path
  from nipype.interfaces.base import File, InputMultiPath, TraitedSpec, traits, isdefined
  from nipype.interfaces.cat12.base import NestedCell, Cell
  from nipype.interfaces.spm import SPMCommand
  from nipype.interfaces.spm.base import SPMCommandInputSpec
  from nipype.utils.filemanip import split_filename
label_desc: Use image node_id 1 for calling the Cell2Str obj's underlying member method code with example usage: obj.__str__() and returns: unknown