[Fixed] ERROR: Could not build wheels for multidict, which is required to install pyproject.toml-based projects – Python

The Problem:

User is trying to install packages in Python 3.12 environment using ‘pip install’, including ‘discord.py’ and ‘pyproject-toml’. However, the installation process encounters an error while building wheels for ‘multidict’. This error prevents the user from successfully installing packages based on ‘pyproject.toml’. The error message indicates a system-level issue with locating a specific file, resulting in the installation failure.

The Solutions:

Solution 1: Install Python 3.12.dev

In this issue, the error message indicates that the user is unable to build wheels for the `multidict` package, which is required for installing projects based on `pyproject.toml`. The issue is resolved by installing `Python 3.12.dev`. Here’s a detailed explanation of the solution:

1. Identifying the Problem: The error message provided includes the following lines:

ERROR: Failed building wheel for multidict
Failed to build multidict
ERROR: Could not build wheels for multidict, which is required to install pyproject.toml-based projects

This indicates that there was an issue building the `multidict` wheel, preventing the installation of `pyproject.toml`-based projects.

2. Solution: Installing Python 3.12.dev:

The user mentioned that the issue was resolved by installing `python3.12-dev`. The `-dev` flag in the package name indicates that it is a development version of the Python interpreter. This version is usually released before the stable version and may include newer features and bug fixes.

3. Why Python 3.12.dev?

The user did not provide a specific explanation as to why installing `Python 3.12.dev` resolved the issue. However, it is possible that this specific version includes a fix or change that addresses the underlying issue causing the failure to build the `multidict` wheel.

4. Potential Pitfalls:

Using a development version of Python may have potential pitfalls like:

• It may be less stable and may contain bugs or issues that have not yet been fully tested or resolved.
• Some packages or libraries may not be compatible with the development version and may cause compatibility issues.
• It may not be as widely supported as the stable version, which can lead to difficulties finding documentation or support.
5. Conclusion:

While installing `Python 3.12.dev` resolved the issue for the user, it is important to weigh the potential drawbacks before using a development version of Python in a production environment. It may be better to wait for the stable release of Python 3.12 or consider other solutions to resolve the issue.

Solution 2: Downgrade the Python version and freeze multidict version

To resolve the issue, you can try the following steps:

1. Downgrade your Python version to 3.11 or below.
2. Install the specific version of multidict using the command pip install multidict==6.0.4.
3. This should freeze the multidict version and prevent it from being updated, which may be causing the issue.
4. Attempt to install the desired package again using pip install pyproject-toml.

By taking these steps, you can potentially bypass the issue and successfully install the required package.

Solution 3: Downgrading Python Version

In this specific case, the user was able to resolve this error by uninstalling Python version 3.12 and installing an older version, Python 3.11.7, which allowed the installation of pyproject.toml-based projects through pip install pyproject-toml.

Solution 4: Install Microsoft Visual C++ Build Tools

If you’re encountering the error "ERROR: Could not build wheels for multidict, which is required to install pyproject.toml-based projects," when trying to install a Python package, you may need to install the Microsoft Visual C++ Build Tools.

1. Download and install the Microsoft Visual C++ Build Tools from the URL provided in the error message.

2. Once installed, open the build tools installation menu and switch to the "Individual components" tab.

3. Find and select the latest version of MSVC build tools for your CPU architecture, most likely x64/x86.

4. Find and select the latest Windows SDK for your Windows version.

5. Click "Install" and you should then be able to build the packages you need. You may need to restart your terminal/editor before you can do this.

Video Explanation:

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