SyntaxError: invalid syntax

[ghost]

$ python main.py preprocess games/*
  File "main.py", line 42
    def preprocess(*data_sets, processed_dir="processed_data"):
                                           ^
SyntaxError: invalid syntax

Using:

$ python --version
Python 2.7.12

[prescod]

You need to use Python 3. I did that this way:

virtualenv -p python3 py3
source py3/bin/activate

This assumes you have python3 and virtualenv installed already.