Why Am I Still Getting "ModuleNotFoundError" in VS Code Even After Installing the Module?

Resolving "ModuleNotFoundError" in VS Code Despite Module Installation

You're facing a "ModuleNotFoundError" exception in VS Code, despite having installed the SimpleITK module using pip. This can be frustrating, especially when you've confirmed the installation elsewhere.

To address this issue, consider the following troubleshooting steps:

1. Reload VS Code:
After installing a new module, reloading VS Code can prompt it to recognize the module. Simply press Ctrl Shift P and select "Reload Window."

2. Verify Virtual Environment:
Ensure that the module is installed within the correct virtual environment. Create and activate a virtual environment by running:

python3 -m venv env
source env/bin/activate

3. Install Module Using "pip install":
As recommended by Brett Cannon in his article, use the correct pip installation command:

python3 -m pip install new_module

Replace "new_module" with the name of your module.

4. Reload VS Code Again:
After completing these steps, reload VS Code again by pressing Ctrl Shift P and selecting "Reload Window." VS Code should now recognize the installed module, including its autocompletion functionality.

Edit (Debian 12 Users):
In Debian 12 and newer versions of Python 3, it's recommended to always use virtual environments to manage packages. Always create a new environment for projects:

python3 -m venv env

Activate the environment by running source env/bin/activate and proceed with module installation within it.

Edit (Python venv Module):
Before using the Python venv module, install it first if you haven't already:

sudo apt install python3-venv

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