Update for Python3 compatibility

[satsumas]

Colab runtime defaults to Python 3. The intro ipynb doesn't run in Python3, so I made two changes to the syntax to fix this.

• Pin version of numpy that is compatible with lucid
• Python3 ranges aren't lists, so explicitly cast to list before using in transformations

Supporting screenshots because ipynb diffs are a bit unwieldy:

[review-notebook-app[bot]]

Check out this pull request on 

See visual diffs & provide feedback on Jupyter Notebooks.

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