AttReader

• class AttReader
  • __init__ (self, f, epsilonstr=EPSILON)
  • read (self)
  • next (self)
  • __iter__ (self)
  • __next__ (self)
  • read_prolog_transducer (f)

---

class AttReader

A class for reading input in AT&T text format and converting it into transducer(s).

The easiest way to create transducers from At&T files are probably functions:

• hfst.read_att_input
• hfst.read_att_string
• hfst.read_att_transducer.

An example that reads AT&T input from file 'testfile.att' where epsilon is represented as <eps> and creates the corresponding transducers and prints them. If the input cannot be parsed, a message showing the invalid line in AT&T input is printed and reading is stopped.

with open('testfile.att', 'r') as f:
    try:
        r = hfst.AttReader(f, "<eps>")
        for tr in r:
            print(tr)
    except hfst.exceptions.NotValidAttFormatException as e:
        print(e.what())

---

__init__ (self, f, epsilonstr=EPSILON)

Create an AttReader that reads input from file f where the epsilon is represented as epsilonstr.

Parameters:

• f A python file.
• epsilonstr How epsilon is represented in the file. By default, @_EPSILON_SYMBOL_@ and @0@ are both recognized.

---

read (self)

Read next transducer.

Read next transducer description in AT&T format and return a corresponding transducer.

Throws:

• hfst.exceptions.NotValidAttFormatException
• hfst.exceptions.EndOfStreamException

---

next (self)

An iterator to the reader.

Needed for 'for ... in' statement:

for transducer in att_reader:
    print(transducer)

---

__iter__ (self)

Return next element (for python version 2). Needed for 'for ... in' statement.

for transducer in att_reader:
    print(transducer)

Throws:

• StopIteration

---

__next__ (self)

Return next element (for python version 3). Needed for 'for ... in' statement.

for transducer in att_reader:
    print(transducer)

Throws:

• StopIteration