Installing your own package

Developing Python Packages

James Fulton

Climate informatics researcher

Why should you install your own package?

Inside example_script.py

import mysklearn

Directory tree for package with subpackages

home/
|-- mysklearn            <-- in same directory
|  |-- __init__.py
|  |-- preprocessing
|  |   |-- __init__.py
|  |   |-- normalize.py
|  |   |-- standardize.py
|  |-- regression
|  |   |-- __init__.py
|  |   |-- regression.py
|  `-- utils.py
|-- example_script.py    <-- in same directory

Why should you install your own package?

Inside example_script.py

import mysklearn

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'mysklearn'

Directory tree

home/
|-- mypackages
|   |-- mysklearn     <---
|       |-- __init__.py
|       |-- preprocessing
|       |   |-- __init__.py
|       |   |-- normalize.py
|       |   |-- standardize.py
|       |-- regression
|           |-- __init__.py
|           |-- regression.py
`-- myscripts
    `-- example_script.py     <---

setup.py

Is used to install the package
Contains metadata on the package

Package directory structure

Directory tree for package with subpackages


    mysklearn/
    |-- __init__.py
    |-- preprocessing
    |   |-- __init__.py
    |   |-- normalize.py
    |   |-- standardize.py
    |-- regression
    |   |-- __init__.py
    |   |-- regression.py
    |-- utils.py

Package directory structure

Directory tree for package with subpackages

mysklearn/      <-- outer directory
|-- mysklearn   <--- inner source code directory
    |-- __init__.py
    |-- preprocessing
    |   |-- __init__.py
    |   |-- normalize.py
    |   |-- standardize.py
    |-- regression
    |   |-- __init__.py
    |   |-- regression.py
    |-- utils.py

Package directory structure

Directory tree for package with subpackages

mysklearn/      <-- outer directory
|-- mysklearn   <--- inner source code directory
|   |-- __init__.py
|   |-- preprocessing
|   |   |-- __init__.py
|   |   |-- normalize.py
|   |   |-- standardize.py
|   |-- regression
|   |   |-- __init__.py
|   |   |-- regression.py
|   |-- utils.py
|-- setup.py   <-- setup script in outer

Inside setup.py

# Import required functions
from setuptools import setup


# Call setup function
setup(

    author="James Fulton",

    description="A complete package for linear regression.",

    name="mysklearn",

    version="0.1.0",

)

version number = (major number) . (minor number) . (patch number)

Inside setup.py

# Import required functions
from setuptools import setup, find_packages

# Call setup function
setup(
    author="James Fulton",
    description="A complete package for linear regression.",
    name="mysklearn",
    version="0.1.0",

    packages=find_packages(include=["mysklearn", "mysklearn.*"]),

)

Editable installation

pip install -e .

. = package in current directory
-e = editable

Directory tree for package with subpackages

mysklearn/  <-- navigate to here
|-- mysklearn
|   |-- __init__.py
|   |-- preprocessing
|   |   |-- __init__.py
|   |   |-- normalize.py
|   |   |-- standardize.py
|   |-- regression
|   |   |-- __init__.py
|   |   |-- regression.py
|   |-- utils.py
|-- setup.py

Let's practice!

Developing Python Packages