Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with
or
.
Download ZIP
Python types for reading and writing fixed text-oriented data records
Python
branch: master

Fetching latest commit…

Cannot retrieve the latest commit at this time

Failed to load latest commit information.
stypes
.gitignore
LICENSE
MANIFEST.in
README.md
requirements.txt
setup.py
test.py

README.md

Encode and Decode Textual Data into Rich Python Data Structures

stypes is a text parsing, conversion and formatting library written to efficiently handle large fixed-width text record data files. Convert text streams into dictionaries, lists, tuples, named tuples, ordered dictionaries and more using text layout specifications. Nested data structures and repeating elements are also supported.

One of the main design goals of the library was to handle legacy text-based record data that is commonly found in COBOL system. Of course, the library can be used to handle any fixed layout textual data.

A simple example of turning some text into a Named Tuple:

from decimal import Decimal
from stypes import NamedTuple, Integer, Numeric
spec = NamedTuple([
    ('name', 10),
    ('age', Integer(3)),
    ('weight', Numeric('999V99'))])
text = "Johnson    2109750"
rec = spec.unpack(text)
assert rec.name == 'Johnson'
assert rec.age == 21
assert rec.weight == Decimal("97.5")

And a more interesting example using nested data structures of a list of records and actually updating a record.

from stypes import Array, Dict, Integer, Numeric
item = Dict([('line_no', Integer(2)),
    ('item_no', Integer(5)),
    ('total', Numeric("999.99"))])
invoice = Dict([
    ('invoice_no', Integer(4)),
    ('total', Numeric("999.99")),
    ('items', Array(3, item))])
text = "0001200.450100004002.000200006198.50"
rec = invoice.unpack(inv)
# rec is now
  {'invoice_no': 1,
   'items': [{'item_no': 4, 'line_no': 1, 'total': Decimal('2.00')},
         {'item_no': 6, 'line_no': 2, 'total': Decimal('198.50')},
         {'item_no': None, 'line_no': None, 'total': None}],
   'total': Decimal('200.45')}

# Set the last invoice item
rec['items'][-1] = {
    'line_no': 3,
    'item_no': 10,
    'total': Decimal("20")}

# Update the invoice total
rec['total'] = sum(i['total'] for i in rec['items'])
print rec.pack()
# '0001220.500100004002.000200006198.500300010020.00'

See the included tests.py file for more examples.

You can install stypes using pip

pip install stypes

or download from PyPI at https://pypi.python.org/pypi/stypes/

Something went wrong with that request. Please try again.