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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