class_docstr: A wrapper around Python 3's builtin :func:`csv.writer`.
class_docstr_tok: ["A","wrapper","around","Python","3","'s","builtin",":","func",":","`","csv.writer","`","."]
code: def _append_line_number(self, row):
      if self.row_count == 0:
          row.insert(0, "line_number")
      else:
          row.insert(0, self.row_count)
  
      self.row_count += 1
  
imports: import csv
  import warnings
  from agate.exceptions import FieldSizeLimitError
label_desc: Use image node_id 2 for calling the Writer obj's underlying member method code with example usage: obj._append_line_number(row) without return types