Why Am I Still Getting 'ModuleNotFoundError' in VS Code Even Though I Installed SimpleITK with Pip?

Troubleshooting "ModuleNotFoundError" in VS Code

Despite having installed the SimpleITK module using pip, VS Code persists in throwing a "ModuleNotFoundError" exception. This can be a perplexing issue, especially considering that the module seems to be available via the command line.

The following steps can help resolve this discrepancy:

1. Reload VS Code: Sometimes, VS Code requires a restart to recognize newly installed modules. Press Ctrl Shift P to open the Command Palette and select "Reload Window."

2. Verify Virtual Environment Usage: Ensure that SimpleITK is installed within the correct virtual environment. Virtual environments isolate Python packages and dependencies, preventing conflicts with global installations. Create a virtual environment using the following commands:

   python3 -m venv env
   source env/bin/activate

3. Install Module Correctly: Use the recommended method for installing Python modules with pip, as outlined by Brett Cannon's article. Replace "new_module" with the name of the module being installed:

   python3 -m pip install new_module

4. Consider Using a Virtual Environment for Debian 12: Debian 12 provides a newer version of Python 3. It is highly recommended to use a virtual environment to manage Python packages, as per PEP 668. Create a new environment for each project using:

   python3 -m venv env

   Activate the environment by running:

   source env/bin/activate

   Install packages within the environment and deactivate it when finished by running:

   deactivate

5. Install Python venv Module: If you encounter errors when creating a virtual environment, ensure that the venv module is installed. For Debian-based systems, use the following command:

   $ sudo apt install python3-venv

By following these steps and reloading VS Code, the "ModuleNotFoundError" exception should be resolved, and the SimpleITK module should be recognized by VS Code.

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