__getitem__ ( self,  key )

Return an item from the indexed file.

__init__ (
        self,
        filename,
        iterator_gen,
        key_gen,
        )

Arguments:

filename

The file to index

iterator_gen

A function that eats a file handle, and returns a file iterator. The iterator has a method next() that returns the next item to be indexed from the file.

key_gen

A function that generates an index key from the items created by the iterator.