Why VS Code Uses Two Different Python Environments and How to Fix It

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VS Code independently tracks two separate Python environments: one used by the Python extension for IntelliSense and linting, and another used by the integrated terminal based on the shell's active state. These two can easily fall out of sync, causing situations where IntelliSense resolves packages correctly but the terminal throws a ModuleNotFoundError, or vice versa. Users can check the active interpreter via the Status Bar and compare it against the terminal's Python path using 'which python' on macOS/Linux or 'where python' on Windows. Switching the interpreter in VS Code does not update already-open terminal panels, so opening a fresh terminal is necessary for the change to take effect. If auto-activation still fails in the new terminal, manually activating the virtual environment resolves the mismatch.

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