Mutable record type for dealing with flat files like CSV or pipe delimited data
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Mutable record type for dealing with flat files like CSV or pipe delimited data.

Dealing with flat files is painful. Instead, use vinyl to declaratively describe and validate common flat file formats. Vinyl gives you the convenience of attribute-style access like a namedtuple, but in a mutable data type suitable for easily transforming data.

import os
import csv
from vinyl.record import Record
from vinyl.fields import VarCharField, FixedCharField

# declare the data format
class TestRecord(Record):
    customer_name = VarCharField(max_length=50)
    customer_number = FixedCharField(field_length=10, pad_with='0', justify='right' )
    start_time = FixedCharField(value='00:00:00', field_length=8)

# create an instance
record = TestRecord()

# read data from a file
with open(os.path.join(os.path.dirname(__file__), 'example.txt')) as f:
    reader = csv.reader(f)
    # copy a row of CSV data to the recordinstance

    # check the name was read correctly
    assert record.customer_name == 'a customer name with max length=50'

    # set a different customer number
    record.customer_number = '3'

    # number is reformatted according to the field settings
    assert record.customer_number == '0000000003'

    # a static field
    assert record.start_time == '00:00:00'

    print repr(record)
    # >>> TestRecord(customer_name=u'a customer name with max length=50',
    #                customer_number=u'0000000003', start_time=u'00:00:00')


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