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| 1 | +# Using Hatch to Migrate setup.py to a pyproject.toml |
| 2 | + |
| 3 | +Hatch can be particularly useful to generate your project's `pyproject.toml` if your project already has a `setup.py`. |
| 4 | + |
| 5 | +:::{admonition} Note |
| 6 | +:class: tip |
| 7 | + |
| 8 | +This step is not necessary and is only useful if your project already has a `setup.py` file defined. |
| 9 | +* If your project does not already define a `setup.py` see [Make your Python code installable](installable-code.md) |
| 10 | +::: |
| 11 | + |
| 12 | +:::{admonition} Learning Objectives |
| 13 | +:class: tip |
| 14 | + |
| 15 | +In this lesson you will learn: |
| 16 | + |
| 17 | +1. The process of using Hatch to transition to using `pyproject.toml` for projects that already have a `setup.py` defined. |
| 18 | +::: |
| 19 | + |
| 20 | +## What is Hatch? |
| 21 | + |
| 22 | +Hatch is a Python package manager designed to streamline the process of creating, managing, and distributing Python packages. It provides a convenient CLI (Command-Line Interface) for tasks such as creating new projects, managing dependencies, building distributions, and publishing packages to repositories like PyPI. |
| 23 | + |
| 24 | +:::{admonition} Get to know Hatch |
| 25 | +:class: tip |
| 26 | + |
| 27 | +See [Get to know Hatch](get-to-know-hatch.md) for more information. |
| 28 | + |
| 29 | +::: |
| 30 | + |
| 31 | +## Prerequisites |
| 32 | + |
| 33 | +Before we begin, ensure that you have Hatch installed on your system. You can install it via pip: |
| 34 | + |
| 35 | +```bash |
| 36 | +pipx install hatch |
| 37 | +``` |
| 38 | + |
| 39 | +## Sample Directory Tree |
| 40 | + |
| 41 | +Let's take a look at a sample directory tree structure before and after using `hatch init`: |
| 42 | + |
| 43 | +### Before `hatch init` |
| 44 | + |
| 45 | +``` |
| 46 | +project/ |
| 47 | +│ |
| 48 | +├── src/ |
| 49 | +│ └── my_package/ |
| 50 | +│ ├── __init__.py |
| 51 | +│ └── module.py |
| 52 | +│ |
| 53 | +├── tests/ |
| 54 | +│ └── test_module.py |
| 55 | +│ |
| 56 | +└── setup.py |
| 57 | +``` |
| 58 | + |
| 59 | +### After `hatch init` |
| 60 | + |
| 61 | +``` |
| 62 | +project/ |
| 63 | +│ |
| 64 | +├── pyproject.toml |
| 65 | +│ |
| 66 | +├── src/ |
| 67 | +│ └── my_package/ |
| 68 | +│ ├── __init__.py |
| 69 | +│ └── module.py |
| 70 | +│ |
| 71 | +├── tests/ |
| 72 | +│ └── test_module.py |
| 73 | +│ |
| 74 | +└── setup.py |
| 75 | +``` |
| 76 | + |
| 77 | +As you can see, the main change after running `hatch init` is the addition of the `pyproject.toml` file in the project directory. |
| 78 | + |
| 79 | +## Step-by-Step Guide |
| 80 | + |
| 81 | +Now, let's walk through the steps to use Hatch to create a `pyproject.toml` file for your project. |
| 82 | + |
| 83 | +1. **Navigate to Your Project Directory**: Open your terminal or command prompt and navigate to the directory where your Python project is located. |
| 84 | + |
| 85 | +2. **Initialize Hatch**: Run the following command to initialize Hatch in your project directory: |
| 86 | + |
| 87 | + ```bash |
| 88 | + hatch new --init |
| 89 | + ``` |
| 90 | + |
| 91 | +3. **Review and Customize**: After running the previous command, Hatch will automatically generate a `pyproject.toml` file based on your existing project configuration. Take some time to review the contents of the generated `pyproject.toml` file. You may want to customize certain settings or dependencies based on your project's requirements (see [pyproject.toml tutorial](pyproject-toml.md) for more information about the `pyproject.toml`). |
| 92 | + |
| 93 | +4. **Verify**: Verify that the `pyproject.toml` file accurately reflects your project configuration and dependencies. You can manually edit the file if needed, but be cautious and ensure that the syntax is correct. |
| 94 | + |
| 95 | +5. **Delete setup.py**: Since we're migrating to using `pyproject.toml` exclusively, the `setup.py` file becomes unnecessary. You can safely delete it from your project directory. |
| 96 | + |
| 97 | +6. **Test Build**: Before proceeding further, it's essential to ensure that your project builds successfully using only the `pyproject.toml` file. Run the following command to build your project: |
| 98 | + |
| 99 | +```bash |
| 100 | +hatch build |
| 101 | +``` |
| 102 | + |
| 103 | +This command will build your project based on the specifications in the `pyproject.toml` file. Make sure to check for any errors or warnings during the build process. |
| 104 | + |
| 105 | +7. **Test Existing Functionality**: After successfully building your project with `pyproject.toml`, it's crucial to ensure that your project's existing functionality remains intact. Run any pre-existing tests to verify that everything still works as expected. |
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