class_docstr: Reads a fixed-width file using a column schema in CSV format.
  
  This works almost exactly like Python's built-in CSV reader.
  
  Schemas must be in the "ffs" format, with :code:`column`, :code:`start`,
  and :code:`length` columns. There is a repository of such schemas
  maintained at `wireservice/ffs <https://github.com/wireservice/ffs>`_.
docstr: The names of the columns read from the schema.
code: def fieldnames(self):
      """
      The names of the columns read from the schema.
      """
      return [field.name for field in self.fields]
  
file_path: agate/agate/fixed.py
imports: from collections import OrderedDict, namedtuple
label_desc: Use image node_id 4 for calling the Reader obj's underlying member method code with example usage: obj.fieldnames() and returns: unknown