class_docstr: One categorical column in a dataset.
class_docstr_tok: ["One","categorical","column","in","a","dataset","."]
code: def emit_header(self):
      sys.stdout.write(self.col_name)
  
imports: import sys
  import os
  import re
  from random import random
  from random import randrange
  from random import uniform
label_desc: Use image node_id 2 for calling the CategoricalColumn obj's underlying member method code with example usage: obj.emit_header() without return types