code: def round_csv_line(line, column, precision):
      parts = line.split(",")
      parts[column] = str(round(float(parts[column]), precision))
      return ",".join(parts)
  
imports: import os
  import six
  from testcases import common
label_desc: Use image node_id 2 for calling a global function with example usage: round_csv_line(line, column, precision) and returns: str