typeline

Write dataclasses to delimited text formats and read them back again.

Features type-safe parsing, optional field support, and an intuitive API for working with structured data.

Installation

The package can be installed with pip:

pip install typeline

Quickstart

Building a Test Dataclass

>>> from dataclasses import dataclass
>>>
>>> @dataclass
... class MyData:
...     field1: int
...     field2: str
...     field3: float | None

Writing

>>> from tempfile import NamedTemporaryFile
>>> from typeline import TsvRecordWriter
>>> 
>>> temp_file = NamedTemporaryFile(mode="w+t", suffix=".txt")
>>>
>>> with TsvRecordWriter.from_path(temp_file.name, MyData) as writer:
...     writer.write_header()
...     writer.write(MyData(10, "test1", 0.2))
...     writer.write(MyData(20, "test2", None))

Reading

>>> from typeline import TsvRecordReader
>>> 
>>> with TsvRecordReader.from_path(temp_file.name, MyData) as reader:
...     for record in reader:
...         print(record)
MyData(field1=10, field2='test1', field3=0.2)
MyData(field1=20, field2='test2', field3=None)

Development and Testing

See the contributing guide for more information.