tressed 0.0.1

Glue types together

tressed

Serialize and deserialize types, in any order.

Usage

from dataclasses import dataclass, field
from tressed.loader import Loader

@dataclass
class SomeDataclass:
    foo: str
    bar: str = "bar"
    baz: list[int] = field(default_factory=lambda: [1, 2, 3])
    bar_bar: tuple[int, str] = field(metadata={"alias": "barBar"}, kw_only=True)

value = {
    "foo": "foo",
    "barBar": (2, "humbug"),
}

loader = Loader()
loaded = loader.load(value, SomeDataclass)

assert loaded == SomeDataclass(
    foo="foo",
    bar="bar",
    baz=[1, 2, 3],
    bar_bar=(2, "humbug"),
)

Supported types

The following types are supported out of the box:

• bool
• int
• float
• str
• tuple[T1, ..., Tn], typing.Tuple[T1, ..., Tn]
• tuple[T, ...], typing.Tuple[T, ...] a.k.a homogeneous tuple
• list[T], typing.List[T]
• set[T], typing.Set[T]
• frozenset[T], typing.FrozenSet[T]
• dataclasses.dataclass

It is easy to add support for custom types as needed when creating a loader.

Installation

Using pip:

pip install tressed

Or using uv:

uv add tressed

Then just import tressed and get coding.

import tressed

Goals

• Provide easy serialization and deserialization to and from built-in and standard library types.
• Provide easy way to add support for custom types.
• Provide easy yet powerful support for serializaiton and deserialization aliases.
• Pure python, no additional runtime dependencies beyond the standard library.
• Do as little work as possible to be suitable for CLIs, for example using lazy imports as much as possible.

Stretch goals

• Add first class support for concurrent loading and dumping, with support for asyncio and threading, for example deserializing a list of M objects on N threads.
• Use code generation internally similarly to dataclasses. Instead of doing metaprogramming each time, generate an actual function for the type that does (de)serialization. Interpret the first time, compile the second, using source or ast module, and then reuse the compiled function.