File writer/parser for fixed-width and character-separated files
Project description
The gocept.recordserialize distribution
File writer/parser for fixed-width and character-separated files.
This package is compatible with Python version 2.7.
Fixed-width format
Define the format by listing all fields, in order. Each field has the following settings:
- name:
Name of the field (required)
- width:
Width of the field in characters (required)
- fill character:
default: Space
- alignment:
default: align LEFT (that is, pad on the right side)
For example:
>>> from gocept.recordserialize import FixedWidthRecord
>>> class FixedExample(FixedWidthRecord):
...
... encoding = 'utf-8'
... lineterminator = '\r\n'
...
... fields = [
... ('one', 3, ' ', FixedWidthRecord.LEFT),
... ('two', 7, '0', FixedWidthRecord.RIGHT),
... ]
Writing
>>> r = FixedExample() >>> r['one'] = 'foo' >>> r['two'] = '12' >>> str(r) 'foo0000012\r\n'
Reading
>>> r = FixedExample.parse('bar0000034\r\n')
>>> r['one']
u'bar'
>>> r['two']
u'34'
Also available: parse_file which takes a file-like object.
Character-separated format
Define the format by declaring attributes on the class. Each field has the following settings:
- position:
position of the field
- default:
default value to write if none is given
- maximum length:
truncate field to this length
Note that you do not have to declare all fields, any positions not declared are filled with empty columns. For this reason, you always have to give the total number of fields in the fields attribute:
>>> from gocept.recordserialize import SeparatedRecord >>> class PipeExample(SeparatedRecord): ... ... fields = 5 ... encoding = 'utf-8' ... separator = '|' ... lineterminator = '\r\n' ... ... first = 1 ... default = 2, 'qux' ... maxlen = 3, 3 ... maxlen_default = 4, 5, 'asdfg'
Writing
>>> r = PipeExample() >>> r['first'] = 'some text' >>> r['maxlen'] = '12345' >>> str(r) 'some text|qux|123|asdfg|\r\n'
Reading
>>> r = PipeExample.parse('some text|qux|123|asdfg|\r\n')
>>> r['first']
u'some text'
>>> r['default']
u'qux'
>>> r['maxlen']
u'123'
>>> r['maxlen_default']
u'asdfg'
Also available: parse_file which takes a file-like object.
Escaping
For subclassing, SeparatedRecord provides classmethods escape and unescape that each value is passed through on write/read. An example that makes use of this is gocept.recordserialize.CSVRecord which escapes quotes:
>>> from gocept.recordserialize import CSVRecord >>> class CSVExample(CSVRecord): ... ... fields = 1 ... one = 1 >>> r = CSVExample() >>> r['one'] = 'my "quoted" string' >>> str(r) '"my \'quoted\' string"\r\n'
Developing gocept.recordserialize
- Author:
- PyPI page:
- Issue tracker:
https://projects.gocept.com/projects/gocept-recordserialize/
- Source code:
Change log for gocept.recordserialize
0.3 (2016-02-29)
Escape unicode characters on errors.
0.2 (2013-11-26)
Fixed dependency on setuptools.
0.1 (2012-09-19)
initial release
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Source Distribution
Hashes for gocept.recordserialize-0.3.tar.gz
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