class_docstr: The abstract base class of codecs.
docstr: String representation sufficient to re-construct this Codec
docstr_tok: ["String","representation","sufficient","to","re-construct","this","Codec"]
code: def __str__(self):
      """String representation sufficient to re-construct this Codec"""
      raise RuntimeError("Abstract method was called")
  
imports: from abc import abstractmethod
  from io import BytesIO
  import numpy
label_desc: Use image node_id 4 for calling the DataframeColumnCodec obj's underlying member method code with example usage: obj.__str__() without return types