docstr: (Internal) Return a placeholder to a number.
docstr_tok: ["(","Internal",")","Return","a","placeholder","to","a","number","."]
code: def _make_num(self):
      """
      (Internal) Return a placeholder to a number.
      """
      self.count_nums += 1
      return self.num_placeholder
  
imports: import random
label_desc: Use image node_id 7 for calling the EquationGenerator obj's underlying member method code with example usage: obj._make_num() and returns: self