fixed is a Python module that provides tools for building fast parsers of files composed of fields width records where one of the fields in the record specifies what type of record the line is.
The parsers built using this package yield named tuples containing the information in each row.
The parsers are specified using a simple and succinct declarative style:
from fixed import Parser, Record, Field, Discriminator, Skip
type = Discriminator('H')
row_count = Field(8, int)
type = Discriminator('D')
source = Field(5)
junk = Skip(10)
destination = Field(5)
parser = Parser(Header, Data)