code: def __init__(self, ret_type):
      self.ret_type = ret_type
      self.arg_ctypes = []
  
      # Input argument array element index
      self.input_arg = 0
  
      # For the case output value is referenced through a parameter rather
      # than the return value
      self.ret_arg = None
  
imports: import ctypes
  from sympy.external import import_module
  from sympy.printing.printer import Printer
  from sympy.core.singleton import S
  from sympy.tensor.indexed import IndexedBase
  from sympy.utilities.decorator import doctest_depends_on
label_desc: Use image node_id 1 to create a new CodeSignature object  with example: obj = CodeSignature(ret_type)