code: def field_size_limit(limit=undefined):
      
  
      global _field_limit
      old_limit = _field_limit
  
      if limit is not undefined:
          if not isinstance(limit, (int, long)):
              raise TypeError("int expected, got %s" %
                              (limit.__class__.__name__,))
          _field_limit = limit
  
      return old_limit
docs: Sets an upper limit on parsed fields.
      csv.field_size_limit([limit])
  
      Returns old limit. If limit is not given, no new limit is set and
      the old limit is returned