wend

PyPI version Python versions License pre-commit.ci status

A library for templated paths using Python t-strings (3.14+)

Installation

uv pip install wend

Requirements

  • Python 3.14+

About

For backstory read my blog about this package cog.spin.systems/future-paths!

The general idea is to use t-strings to house eagerly instantiated parameter objects which offer a form of deferred execution.

Usage

Following the examples in the blog post:

from pathlib import Path
from wend import Param, P, T, RelativePath

# Define parameters (late-bound)
root = Param("root")
dataset = Param("dataset")
idx = Param("idx")
total = Param("total")

# Build expressions - these don't touch the filesystem
data_dir = root / "data" / dataset
chunk_file = data_dir / T(t"chunk_{idx:04d}-of-{total:04d}.parquet")

# Inspect what's needed
print("Required params:", chunk_file.required_params())
# -> {'root', 'dataset', 'idx', 'total'}

# Resolve with bindings
path = chunk_file.resolve({
    "root": "/mnt/storage",
    "dataset": "train",
    "idx": 7,
    "total": 100,
})
print("Resolved:", path)
# -> /mnt/storage/data/train/chunk_0007-of-0100.parquet

# Constant folding happens at construction
folded = P("/home") / "user" / "data"
print("Folded type:", type(folded).__name__)
# -> LiteralExpr (not nested JoinExprs)

# Parent simplification
expr = root / "a" / "b"
print("Parent of join:", expr.parent)
# -> JoinExpr(ParamExpr, LiteralExpr("a")) -- the "b" is gone structurally

# Suffix chain collapse
double_suffix = (root / "file.txt").with_suffix(".tmp").with_suffix(".json")
print("Suffix chain:", double_suffix)
# -> WithSuffixExpr(base=JoinExpr(...), suffix='.json') -- .tmp is gone

# Connectivity: rebasing
config = RelativePath(
    base=root,
    relative=P("config") / "settings.yaml"
)
print("Config path:", config.resolve({"root": "/project"}))
# -> /project/config/settings.yaml

# Rebase to test environment
test_config = config.rebase(P("/tmp/test"))
print("Test config:", test_config.resolve({}))
# -> /tmp/test/config/settings.yaml

Contributing

Contributions are welcome! Please:

  1. Open an issue to discuss bugs or feature requests
  2. Fork the repo and submit a PR for changes
  3. Install dev dependencies with uv sync and run pre-commit install

License

MIT License - see LICENSE for details.

Project links

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Credits

Author: Louis Maddox

GitHub Statistics

Data verified by PyPI on Feb 3, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License

MIT License (MIT)

Requires

Python >=3.14

Tags

paths t-strings

Classifiers

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