Intro¶
iso8583 - a Python package for parsing ISO8583 data¶
iso8583 package serializes and deserializes ISO8583 data between a bytes or
bytearray instance containing ISO8583 data and a Python dict.
iso8583 package supports custom specifications that can define
- Field length and data encoding, such as BCD, ASCII, EBCDIC, etc.
- Field type, such as fixed, LLVAR, LLLVAR, etc.
- Maximum length
- Optional field description
Multiple specifications can co-exist to support ISO8583 messages for POS, ATM, file actions, and so on. Simply define a new specification dictionary. iso8583 package includes a starter specification in iso8583.specs module that can be used as a base to create own custom/proprietary specifications.
Additional information is available on RTD.
Install:
pip install pyiso8583
Encoding & Decoding¶
Use iso8583.decode to decode raw ISO8583 message. It returns two dictionaries: one with decoded data and one with encoded data.
>>> import pprint
>>> import iso8583
>>> from iso8583.specs import default_ascii as spec
>>> encoded_raw = b'02004000000000000000101234567890'
>>> decoded, encoded = iso8583.decode(encoded_raw, spec)
>>> pprint.pp(decoded)
{'t': '0200', 'p': '4000000000000000', '2': '1234567890'}
>>> pprint.pp(encoded)
{'t': {'len': b'', 'data': b'0200'},
'p': {'len': b'', 'data': b'4000000000000000'},
'2': {'len': b'10', 'data': b'1234567890'}}
Modify the decoded message to send a response back. Change message type from ‘0200’ to ‘0210’. Remove field 2 (PAN). And add field 39 (Response Code).
>>> decoded['t'] = '0210'
>>> decoded.pop('2', None)
'1234567890'
>>> decoded['39'] = '05'
Use iso8583.encode to encode updated ISO8583 message. It returns a raw ISO8583 message and a dictionary with encoded data.
>>> encoded_raw, encoded = iso8583.encode(decoded, spec)
>>> encoded_raw
bytearray(b'0210000000000200000005')
>>> pprint.pp(decoded)
{'t': '0210', 'p': '0000000002000000', '39': '05'}
>>> pprint.pp(encoded)
{'t': {'len': b'', 'data': b'0210'},
'p': {'len': b'', 'data': b'0000000002000000'},
'39': {'len': b'', 'data': b'05'}}
Pretty Print Messages¶
Use iso8583.pp to pretty print ISO8583 message.
>>> import iso8583
>>> from iso8583.specs import default_ascii as spec
>>> encoded_raw = b'02004000000000000000101234567890'
>>> decoded, encoded = iso8583.decode(encoded_raw, spec)
>>> iso8583.pp(decoded, spec)
t Message Type : '0200'
p Bitmap, Primary : '4000000000000000'
2 Primary Account Number (PAN) : '1234567890'
>>> iso8583.pp(encoded, spec)
t Message Type : b'0200'
p Bitmap, Primary : b'4000000000000000'
2 Primary Account Number (PAN) : b'10' b'1234567890'