code: def get_default_qubit_mapping(program):
      
      fake_qubits, real_qubits, qubits = _what_type_of_qubit_does_it_use(program)
      if real_qubits:
          warnings.warn("This program contains integer qubits, "
                        "so getting a mapping doesn't make sense.")
          return {q: q for q in qubits}
      return {qp: Qubit(i) for i, qp in enumerate(qubits)}
docs: Takes a program which contains qubit placeholders and provides a mapping to the integers
      0 through N-1.
  
      The output of this function is suitable for input to :py:func:`address_qubits`.
  
      :param program: A program containing qubit placeholders
      :return: A dictionary mapping qubit placeholder to an addressed qubit from 0 through N-1.