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Choice of Version
Python comes as Python version 2 or version 3. The latter was introduced to resolve core issues of Python, for the cost of backwards compatibility in syntax and features. Compare:
https://wiki.python.org/moin/Python2orPython3
In Fusion, you have the choice to either use Python 2.7 or 3.3. Depending on your task, either use
2.7 (widest range of applications supported) or 3.3 if your pipeline depends on it.
At the time of writing, the recommended VFX reference platform suggests the latest Python 2.7 version, so many facilities may depend on this version.