class_docstr: Lightweight immutable Dataframe similar to Pandas Dataframe.
class_docstr_tok: ["Lightweight","immutable","Dataframe","similar","to","Pandas","Dataframe","."]
code: def __call__(
      self, r: int, c: Optional[Union[int, str]] = None
  ) -> Any:
      if c is None:
          return dict(zip(self.column_names, self.rows[r]))
      c = self._column_names.index(c) if isinstance(c, str) else c
      return self._rows[r][c] if self._rows else self._columns[c][r]
  
imports: import itertools
  import json
  from typing import Any, Callable, Optional, Sequence, Tuple, Union
  from collections import namedtuple
  import numpy
  from tensorflow.python.compiler.tensorrt.model_tests import model_handler
  import tensorflow.python.compiler.tensorrt.trt_convert
  from tensorflow.python.platform import tf_logging
label_desc: Use image node_id 9 for calling the DataFrame obj's underlying member method code with example usage: obj.__call__(r, c) and returns: unknown, dict