code: def as_python_bytes(self):
      if self.op is None and self.arg.isdigit():
          value = int(self.arg)  # non-negative: '-' not in self.arg
          if value >= 2**31:
              raise OverflowError(
                  "cannot emit %r: limited to 2**31-1" % (self.arg,)
              )
          return format_four_bytes(value)
      if isinstance(self.arg, str):
          raise VerificationError(
              "cannot emit to Python: %r" % (self.arg,)
          )
      return format_four_bytes((self.arg << 8) | self.op)
  
file_path: catboost/contrib/python/cffi/py2/cffi/cffi_opcode.py
imports: from .error import VerificationError
label_desc: Use image node_id 3 for calling the CffiOp obj's underlying member method code with example usage: obj.as_python_bytes() and returns: format_four_bytes, format_four_bytes