PyCharm#

If you use JetBrains PyCharm, you can link your existing project directory and virtual environment in a few steps.

Open the Project Folder: Launch PyCharm, select Open, and select the project directory where you created your .venv (or Conda environment) in Core Software.
Configure the Python Interpreter: PyCharm usually auto-detects an existing .venv folder and selects it automatically (visible in the bottom-right status bar as .venv [3.xx.yy]). If it is not configured automatically:
- Click the interpreter widget in the bottom-right corner of the window, or open File > Settings (Windows/Linux) / PyCharm > Settings (macOS).
- Go to Project: <your_project_name> > Python Interpreter.
- Click Add Interpreter and select Add Local Interpreter….
- Select Existing, then browse to the Python executable inside your .venv:
  - Windows: .venv\Scripts\python.exe
  - macOS / Linux: .venv/bin/python
  - For Conda: Select Conda Environment, choose Use existing environment, and select your opensim-env from the drop-down menu.
Verify OpenSim Import: Open a new .py file or the built-in PyCharm Python Console (View > Tool Windows > Python Console) and run:
```
import opensim
import opynsim

print(opensim.__file__)
```

For detailed documentation including step-by-step UI references, see the official JetBrains documentation: