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# Platform-specific instructions: Mac OS X

## Dependencies

If you are using OS X, download the following installers and follow their instructions:

- Python 2
- Tcl
- Pygame

and, if needed:

- NumPy
- PyOpenGL and PySerial (has to be installed as described here).

## Installing Expyriment

Download “expyriment-0.7.0.zip from the Release page and install as described here.

## Notes

Do not start your experiments out of IDLE

> If you are using the IDLE editor that comes with the Python installation, be aware that IDLE itself is written in Python. Starting your Expyriment programme out of IDLE (by clicking on “Run” or by pressing F5), might thus lead to improper timing!

> We therefore strongly suggest to run Expyriment programmes from the command line when testing participants.

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