Google Colab: pip install fastbook produces dependency error with tornado v6.1

Part 1 (2020)
2

Never mind, was able to resolve this by restarting the runtime, and then executing the pip install again.

To be clear, these are the steps I took to fix:

  1. Run !pip install -Uqq fastbook
  2. Colab reports the “tornado 6.1 incompatible” error
  3. Then restart the runtime (without using factory reset)
  4. Run !pip install -Uqq fastbook again
  5. Problem is fixed and can continue working through the chapter
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