Use Poetry to Install Python Packages

In this short guide, you’ll see the full steps to use Poetry to install Python packages and manage dependencies.

Steps to use Poetry

Step 1: Create a new project

To start, create a new project (or navigate to an existing one).

For example, let’s say that you created a project called “check_poetry

Step 2: Install Poetry

Go to the terminal and install Poetry using this command:

pip install poetry

Step 3: Initialize a Poetry project

You can initialize a Poetry project using this command:

poetry init

This command will guide you through creating your pyproject.toml config file.

For example (you may fill the details based on your needs, or skip sections by pressing Enter):

Package name [check_poetry]:
Version [0.1.0]:
Description []:  This is my new project
Author [None, n to skip]: None
License []:
Compatible Python versions [^3.11]:

Would you like to define your main dependencies interactively? (yes/no) no

Would you like to define your development dependencies interactively? (yes/no) no

Do you confirm generation? (yes/no) [yes] yes

The pyproject.toml file will be created under your project’s directory. You may edit the above details in this toml file as needed.

Step 4: Add all your packages and their versions in the pyproject.toml file

Open the pyproject.toml file and add your packages under [tool.poetry.dependencies]

Here is an example, where we’ll add the “Pandas” and “Pytest” packages:

name = "check-poetry"
version = "0.1.0"
description = "This is my new project"
authors = ["None"]
readme = ""

python = "^3.11"
pandas = "^2.0.1"
pytest = "^7.3.0"

requires = ["poetry-core"]
build-backend = "poetry.core.masonry.api"

Note that the “^” symbol means that Poetry will install the latest compatible version within the specified range.

Step 5: Install the packages and the dependencies

Use the following command to install all the packages you defined under the [tool.poetry.dependencies] section:

poetry install

Step 6 (optional): Check that the packages were added

You should be able to import and use the new packages without any errors.

For example:

import pandas as pd
import pytest

Step 7 (optional): Add new packages

If you decide to add a new package, you can then use the following command to add your package:

poetry add package_name

For example, add “matplotlib” as follows:

poetry add matplotlib

Check that the new package was added:

import matplotlib.pyplot as plt

Alternatively, you can add new packages under the [tool.poetry.dependencies] section in the pyproject.toml file:

python = "^3.11"
pandas = "^2.0.1"
pytest = "^7.3.0"
matplotlib = "^3.8.0"

And then type poetry update in the terminal:

poetry update

Step 8 (optional): Remove packages

You can remove a package using this command:

poetry remove package_name

Alternatively, you can remove packages under the [tool.poetry.dependencies] section in the pyproject.toml file, and then type poetry update in the terminal:

poetry update

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