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A simple python library for quickly parsing records in a fixed width format.

Project description


A simple and very lightweight library for working with fixed width files.


class Field


Field(number: int, name: int, string: bool, size:int)

  • number: int (Positional identifier for the field)
  • name: str (Name of the field)
  • string: bool (Indicates if the field is a string, if false it is numeric)
  • size: int (Length of the field)


Field(5, 'Name', True, 30)

class RecordType


RecordType(name="", fields=[])

  • name: str (Name of the RecordType, if you have more than one)
  • fields: list (List of fields for the specification tied to the RecordType)
  • field_widths: tuple (Returns tuple of the widths from the fields)
  • field_names: list (Returns list of the field names)


function get_fields

Slices a string 's' in segments 'args' wide. Negative widths represent ignored padding fields.


  • s: string
  • args: list of widths for the string, negative numbers are skipped

Returns string 's' in a list, minus the skipped fields

function get_line

Takes a string and extracts the record identifier if it exists.


  • string (String to be sliced into a list of fields)
  • rec_type_start=-1 (If the string contains a record identifier, this will start to parse it out)
  • rec_type_end=-1 (If the string contains a record identifier, this will end to parse it out)

Returns Tuple of the record identifier and the string it was in.

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