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Parsing Fixed-Length File Records with Python

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Parsing Fixed-Length File Records with Python

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I’ve recently had to deal with parsing fixed-length file records and found struct.unpack and namedtuple to be a pretty useful and concise combination for the task:

>>> from struct import unpack
>>> from collections import namedtuple
>>> line = '    23C   17000'
>>> Transaction = namedtuple('Transaction', 'code status amount')
>>> format = '<6sc8s' # code: 6bytes, status: 1byte, amount: 8bytes
>>> txn = Transaction._make(unpack(format, line))
>>> txn
Transaction(code='    23', status='C', amount='   17000')
>>> txn.code, txn.status, txn.amount
('    23', 'C', '   17000')

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