diff --git a/.gitignore b/.gitignore
index 235d5309..f257ff9d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,4 +28,5 @@ local
 # Python build artifacts
 *.so
 __pycache__/
-*.pyc
\ No newline at end of file
+*.pyc
+python/dist/
\ No newline at end of file
diff --git a/docs/plans/mojo4py.md b/docs/plans/mojo4py.md
index 87dfe8ae..9ef4db5f 100644
--- a/docs/plans/mojo4py.md
+++ b/docs/plans/mojo4py.md
@@ -116,15 +116,23 @@ The binding code lives in a top-level `python/` directory at the project root, p
 
 ```txt
 python/
-├── decimo_module.mojo        ← Mojo binding source (builds to _decimo.so)
-├── _decimo.so                ← compiled extension (gitignored)
-├── decimo.py                 ← Python wrapper: Decimal class + BigDecimal alias
+├── pyproject.toml            ← PyPI package config (hatchling, src layout)
+├── README.md                 ← PyPI landing page
+├── decimo_module.mojo        ← Mojo binding source (builds to src/decimo/_decimo.so)
+├── src/
+│   └── decimo/
+│       ├── __init__.py       ← Python wrapper: Decimal class + BigDecimal alias
+│       ├── _decimo.pyi       ← Type stub for Pylance/mypy
+│       ├── _decimo.so        ← compiled extension (gitignored)
+│       └── py.typed          ← PEP 561 marker
 └── tests/
     └── test_decimo.py        ← Python tests
 ```
 
 The core Mojo library (`src/decimo/`) is not modified — all binding logic lives in `python/decimo_module.mojo` as free functions.
 
+The `src` layout (PEP 517) is used so that `pip install -e python/` installs cleanly and the package is importable as `from decimo import Decimal` without any path manipulation.
+
 ### 4.1 Two-Layer Architecture
 
 Due to CPython slot limitations (see Phase 0 findings in Section 8), a two-layer pattern is used:
@@ -136,11 +144,11 @@ This keeps the core `BigDecimal` struct unmodified and provides full Pythonic be
 
 ### 4.2 The `Decimal` Alias
 
-The `Decimal` alias is set in `decimo.py` as the primary class name, with `BigDecimal = Decimal` for users who prefer the full name:
+The `Decimal` alias is set in `src/decimo/__init__.py` as the primary class name, with `BigDecimal = Decimal` for users who prefer the full name:
 
 ```python
-# python/decimo.py
-from _decimo import BigDecimal as _BigDecimal
+# python/src/decimo/__init__.py
+from ._decimo import BigDecimal as _BigDecimal
 
 class Decimal:
     __slots__ = ("_inner",)
@@ -164,17 +172,20 @@ from decimo import BigDecimal       # also works, same class
 
 ## 5. Build System Integration (pixi.toml)
 
-Tasks added to `pixi.toml`:
+Tasks in `pixi.toml`:
 
 ```toml
 # python bindings (mojo4py)
-pybuild = "pixi run mojo build python/decimo_module.mojo --emit shared-lib -I src -o python/_decimo.so"
-pytest = "pixi run pybuild && pixi run python python/tests/test_decimo.py"
+bpy     = "clear && pixi run buildpy"
+buildpy = "pixi run mojo build python/decimo_module.mojo --emit shared-lib -I src -o python/src/decimo/_decimo.so"
+testpy  = "pixi run buildpy && pixi run python python/tests/test_decimo.py"
+tpy     = "clear && pixi run testpy"
+wheel   = "cd python && pixi run python -m build --wheel"
 ```
 
-- `pixi run pybuild` — compiles the Mojo binding to `python/_decimo.so`.
-- `pixi run pytest` — builds then runs the Python test suite.
-- The `-I src` flag ensures `import decimo` in the Mojo binding resolves to `src/decimo/`. No need to pre-package `decimo.mojopkg`.
+- `pixi run buildpy` — compiles the Mojo binding directly into the installable package at `python/src/decimo/_decimo.so`. No need to pre-package `decimo.mojopkg`; the `-I src` flag resolves `import decimo` to `src/decimo/`.
+- `pixi run testpy` — builds then runs the Python test suite.
+- `pixi run wheel` — produces a pure-Python placeholder wheel in `python/dist/` (no `.so` included); suitable for PyPI name reservation.
 
 ---
 
@@ -335,9 +346,14 @@ jobs:
 - [x] Manually build the `.so` with `mojo build --emit shared-lib -I src`.
 - [x] Import from Python, confirm round-trip: `str(Decimal("1.23")) == "1.23"`.
 - [x] Identify trait gaps (`Representable`, `Movable`, etc. — all satisfied).
-- [x] Arithmetic: `+`, `-`, `*` work. Comparison: `==`, `<`, `<=`, `>`, `>=`, `!=` work.
+- [x] Arithmetic: `+`, `-`, `*`, `/` work. Comparison: `==`, `<`, `<=`, `>`, `>=`, `!=` work.
 - [x] `Decimal` alias (`Decimal is BigDecimal` → `True` in Python).
 - [x] Large arbitrary-precision numbers work (38+ digit numbers).
+- [x] Cross-validated all operations against Python stdlib `decimal.Decimal`.
+- [x] Type stubs (`_decimo.pyi`) and `py.typed` PEP 561 marker.
+- [x] `pyproject.toml` + `src` layout for PyPI; placeholder wheel built and uploaded to PyPI.
+- [x] CI: `test-python` job in GitHub Actions parallel CI.
+- [x] Python code formatter: `ruff` integrated into `pixi run format` and pre-commit.
 
 **Phase 0 findings & architecture decisions:**
 
@@ -391,12 +407,13 @@ jobs:
 
 ### Phase 4 — Packaging + Distribution
 
-- [ ] Create `python/` directory with `pyproject.toml` and `__init__.py`.
-- [ ] Write `.pyi` stubs for all types.
-- [ ] Add `py.typed` marker (PEP 561).
-- [ ] Test `pip install` of the built wheel locally.
+- [x] Create `python/` directory with `pyproject.toml` (hatchling, src layout) and `src/decimo/__init__.py`.
+- [x] Write `.pyi` stubs for `BigDecimal` (`_decimo.pyi`).
+- [x] Add `py.typed` marker (PEP 561).
+- [x] PyPI name reserved — placeholder wheel (`0.1.0.dev0`) published to PyPI.
+- [ ] Test `pip install` of the built wheel locally (blocked until pre-built `.so` in wheel).
 - [ ] Set up GitHub Actions for wheel builds (macOS arm64, Linux x86_64).
-- [ ] Publish to PyPI (or TestPyPI first).
+- [ ] Publish platform-specific wheels with bundled `.so`.
 
 ### Phase 5 — Ergonomics + Stabilization
 
diff --git a/pixi.lock b/pixi.lock
index 82bdb56d..0e29d3f2 100644
--- a/pixi.lock
+++ b/pixi.lock
@@ -13,14 +13,37 @@ environments:
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       - conda: https://repo.prefix.dev/modular-community/linux-64/argmojo-0.1.0-hb0f4dca_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/backports-1.0-pyhd8ed1ab_5.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/backports.tarfile-1.2.0-pyhcf101f3_2.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/backports.zstd-1.3.0-py313h18e8e13_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/brotli-python-1.2.0-py313hf159716_1.conda
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       - conda: https://conda.anaconda.org/conda-forge/noarch/ca-certificates-2026.2.25-hbd8a1cb_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/certifi-2026.2.25-pyhd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/cffi-2.0.0-py313hf46b229_1.conda
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+      - conda: https://conda.anaconda.org/conda-forge/noarch/id-1.6.1-pyhcf101f3_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/idna-3.11-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/importlib-metadata-8.7.0-pyhe01879c_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/importlib_resources-6.5.2-pyhd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/jaraco.classes-3.4.0-pyhcf101f3_3.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/jaraco.context-6.1.0-pyhcf101f3_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/jaraco.functools-4.4.0-pyhcf101f3_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/jeepney-0.9.0-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/jupyter_client-8.6.3-pyhd8ed1ab_1.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/jupyter_core-5.9.1-pyhc90fa1f_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/keyring-25.7.0-pyha804496_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/keyutils-1.6.3-hb9d3cd8_0.conda
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       - conda: https://conda.anaconda.org/conda-forge/linux-64/ld_impl_linux-64-2.45.1-default_hbd61a6d_101.conda
@@ -29,7 +52,9 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libffi-3.5.2-h3435931_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libgcc-15.2.0-he0feb66_18.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libgcc-ng-15.2.0-h69a702a_18.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/libglib-2.86.4-h6548e54_1.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libgomp-15.2.0-he0feb66_18.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/libiconv-1.18-h3b78370_2.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/liblzma-5.8.2-hb03c661_0.conda
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       - conda: https://conda.anaconda.org/conda-forge/linux-64/libsodium-1.0.20-h4ab18f5_0.conda
@@ -38,43 +63,82 @@ environments:
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       - conda: https://conda.anaconda.org/conda-forge/linux-64/libuuid-2.41.3-h5347b49_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libzlib-1.3.1-hb9d3cd8_2.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/markdown-it-py-4.0.0-pyhd8ed1ab_0.conda
       - conda: https://conda.modular.com/max-nightly/noarch/mblack-26.1.0-release.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/mdurl-0.1.2-pyhd8ed1ab_1.conda
       - conda: https://conda.modular.com/max-nightly/linux-64/mojo-0.26.1.0-release.conda
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       - conda: https://conda.modular.com/max-nightly/noarch/mojo-python-0.26.1.0-release.conda
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       - conda: https://conda.anaconda.org/conda-forge/noarch/mypy_extensions-1.1.0-pyha770c72_0.conda
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+- conda: https://conda.anaconda.org/conda-forge/osx-arm64/zstd-1.5.7-hbf9d68e_6.conda
+  sha256: 9485ba49e8f47d2b597dd399e88f4802e100851b27c21d7525625b0b4025a5d9
+  md5: ab136e4c34e97f34fb621d2592a393d8
+  depends:
+  - __osx >=11.0
+  - libzlib >=1.3.1,<2.0a0
+  license: BSD-3-Clause
+  license_family: BSD
+  size: 433413
+  timestamp: 1764777166076
diff --git a/pixi.toml b/pixi.toml
index 4284102c..808a12ab 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -12,7 +12,9 @@ version = "0.8.0"
 argmojo = ">=0.1.0,<0.2" # CLI argument parsing for the Decimo calculator
 mojo = "==0.26.1" # Mojo language compiler and runtime
 python = ">=3.13,<3.14" # For Python bindings and tests
+python-build = ">=1.4.0,<2" # Build PyPI wheel (`pixi run wheel`)
 ruff = ">=0.9,<1" # Python code formatter
+twine = ">=6.2.0,<7" # Upload wheel to PyPI (`twine upload dist/*`)
 
 [tasks]
 # format the code
@@ -82,6 +84,8 @@ testcli = "bash tests/test_cli.sh"
 # python bindings (mojo4py)
 bpy = "clear && pixi run buildpy"
 buildpy = """pixi run mojo build python/decimo_module.mojo \
---emit shared-lib -I src -o python/_decimo.so"""
+--emit shared-lib -I src -o python/src/decimo/_decimo.so"""
 testpy = "pixi run buildpy && pixi run python python/tests/test_decimo.py"
 tpy = "clear && pixi run testpy"
+# build PyPI wheel (placeholder, no .so included)
+wheel = "cd python && pixi run python -m build --wheel"
diff --git a/python/README.md b/python/README.md
new file mode 100644
index 00000000..2677b71c
--- /dev/null
+++ b/python/README.md
@@ -0,0 +1,62 @@
+# decimo
+
+**Arbitrary-precision decimal and integer arithmetic for Python, powered by Mojo.**
+
+[![PyPI](https://img.shields.io/pypi/v/decimo)](https://pypi.org/project/decimo/)
+[![License](https://img.shields.io/badge/license-Apache--2.0-blue)](https://github.com/forfudan/decimo/blob/main/LICENSE)
+
+> ⚠️ **Pre-Alpha / Placeholder release.**  
+> The Python bindings are under active development. A proper installable wheel is coming soon.  
+> Full Mojo library is already available — see the [main repository](https://github.com/forfudan/decimo).
+
+---
+
+## What is decimo?
+
+`decimo` is an arbitrary-precision decimal and integer library, originally written in [Mojo](https://www.modular.com/mojo).  
+This package exposes `decimo`'s `BigDecimal` type to Python via a Mojo-built CPython extension module (`_decimo.so`),
+with a thin Python wrapper providing full Pythonic operator support.
+
+```python
+from decimo import Decimal
+
+a = Decimal("1.234567890123456789012345678901234567890")
+b = Decimal("9.876543210987654321098765432109876543210")
+
+print(a + b)   # 11.111111101111111110111111111111111111100
+print(a * b)   # 12.193263111263526900...
+print(a / b)   # 0.12499999...
+```
+
+## Status
+
+| Feature | Status |
+|---|---|
+| `Decimal` (BigDecimal) arithmetic (`+`, `-`, `*`, `/`) | ✅ Working |
+| Comparison operators | ✅ Working |
+| Unary `-`, `abs()`, `bool()` | ✅ Working |
+| Pre-built wheels on PyPI | 🚧 Coming soon |
+| `BigInt` / `Decimal128` Python bindings | 🔜 Planned |
+
+## Building from source
+
+The extension requires [Mojo](https://docs.modular.com/mojo/manual/get-started/) and [pixi](https://pixi.sh):
+
+```bash
+git clone https://github.com/forfudan/decimo
+cd decimo
+pixi run buildpy
+# .so is built at python/src/decimo/_decimo.so
+```
+
+Then install in editable mode:
+
+```bash
+pip install -e python/
+```
+
+## Links
+
+- **GitHub**: <https://github.com/forfudan/decimo>
+- **Changelog**: <https://github.com/forfudan/decimo/blob/main/docs/changelog.md>
+- **Mojo library docs**: <https://github.com/forfudan/decimo/blob/main/docs/api.md>
diff --git a/python/pyproject.toml b/python/pyproject.toml
new file mode 100644
index 00000000..d86ffd8c
--- /dev/null
+++ b/python/pyproject.toml
@@ -0,0 +1,40 @@
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/decimo"]
+
+[project]
+name = "decimo"
+version = "0.1.0.dev0"
+description = "Arbitrary-precision decimal and integer arithmetic for Python, powered by Mojo"
+readme = "README.md"
+license = { text = "Apache-2.0" }
+authors = [{ name = "ZHU Yuhao (朱宇浩)", email = "dr.yuhao.zhu@outlook.com" }]
+requires-python = ">=3.11"
+keywords = [
+    "decimal",
+    "arbitrary-precision",
+    "mojo",
+    "bigdecimal",
+    "arithmetic",
+    "numeric",
+]
+classifiers = [
+    "Development Status :: 2 - Pre-Alpha",
+    "Intended Audience :: Developers",
+    "License :: OSI Approved :: Apache Software License",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Topic :: Scientific/Engineering :: Mathematics",
+    "Typing :: Typed",
+]
+
+[project.urls]
+Homepage = "https://github.com/forfudan/decimo"
+Repository = "https://github.com/forfudan/decimo"
+Issues = "https://github.com/forfudan/decimo/issues"
+Changelog = "https://github.com/forfudan/decimo/blob/main/docs/changelog.md"
diff --git a/python/decimo.py b/python/src/decimo/__init__.py
similarity index 88%
rename from python/decimo.py
rename to python/src/decimo/__init__.py
index 8ec75594..3953f69b 100644
--- a/python/decimo.py
+++ b/python/src/decimo/__init__.py
@@ -8,7 +8,20 @@
     print(a + b)  # 3.8
 """
 
-from _decimo import BigDecimal as _BigDecimal
+__version__ = "0.1.0.dev0"
+__all__ = ["Decimal", "BigDecimal"]
+
+try:
+    from ._decimo import BigDecimal as _BigDecimal
+except ImportError as _err:
+    raise ImportError(
+        "decimo requires a compiled Mojo extension (_decimo native module).\n"
+        "This package does not yet include pre-built wheels.\n"
+        "Build from source:\n"
+        "  git clone https://github.com/forfudan/decimo && cd decimo\n"
+        "  pixi run buildpy\n"
+        "  pip install -e python/\n"
+    ) from _err
 
 
 class Decimal:
diff --git a/python/_decimo.pyi b/python/src/decimo/_decimo.pyi
similarity index 100%
rename from python/_decimo.pyi
rename to python/src/decimo/_decimo.pyi
diff --git a/python/src/decimo/py.typed b/python/src/decimo/py.typed
new file mode 100644
index 00000000..e69de29b
diff --git a/python/tests/test_decimo.py b/python/tests/test_decimo.py
index 826b6726..1669d258 100644
--- a/python/tests/test_decimo.py
+++ b/python/tests/test_decimo.py
@@ -8,8 +8,8 @@
 from pathlib import Path
 import sys
 
-# Add python/ directory to sys.path so `import decimo` resolves to decimo.py
-sys.path.insert(0, str(Path(__file__).resolve().parent.parent))
+# Add python/src/ to sys.path so `import decimo` resolves to src/decimo/__init__.py
+sys.path.insert(0, str(Path(__file__).resolve().parent.parent / "src"))
 
 import decimo