Created temporary directory: /tmp/pip-ephem-wheel-cache-qvu11zii
Created temporary directory: /tmp/pip-req-tracker-lwwhx8dj
Created requirements tracker '/tmp/pip-req-tracker-lwwhx8dj'
Created temporary directory: /tmp/pip-wheel-gl_dg797
Collecting jupyter-book==0.4.1
  1 location(s) to search for versions of jupyter-book:
  * https://pypi.org/simple/jupyter-book/
  Getting page https://pypi.org/simple/jupyter-book/
  Analyzing links from page https://pypi.org/simple/jupyter-book/
    Found link https://files.pythonhosted.org/packages/62/02/7c5a91aec9361dabe65e2f9be35244f5f9dd69d1053e36462e8dc01cd729/jupyter-book-0.1.tar.gz#sha256=1a0bfd2c4c607c83d7b5c650e380a6d14ac02e23753c0b5d93dac282f4ed0d5f (from https://pypi.org/simple/jupyter-book/) (requires-python:>=3.4), version: 0.1
    Found link https://files.pythonhosted.org/packages/e5/83/ca521c00b8f74f97fb22cd6c80b6b46a2a3054374024ef7ad6db3b5ce732/jupyter_book-0.1-py3-none-any.whl#sha256=7a90477a7334d3540e03b6d5dd960d72daefcd397a644a513af55d40deb94e0f (from https://pypi.org/simple/jupyter-book/) (requires-python:>=3.4), version: 0.1
    Found link https://files.pythonhosted.org/packages/4a/07/8f7c1da9f1c2f38cbefa9daa9e07702135e2bd1af4e7a4b3a8f208b12445/jupyter_book-0.3-py2.py3-none-any.whl#sha256=f769560d8b7e5b7b08d476d3144262b40252ad47b421461ebef3743d3b33afc8 (from https://pypi.org/simple/jupyter-book/), version: 0.3
    Found link https://files.pythonhosted.org/packages/86/2a/6c4e056bd07241f1027dbdc570cf027a191feacec94ab2ea1d6a3200e7fc/jupyter_book-0.3.tar.gz#sha256=21df78e2af861ed8085c946671c71c57fbc1737090561a8013ad37857df227dd (from https://pypi.org/simple/jupyter-book/), version: 0.3
    Found link https://files.pythonhosted.org/packages/8f/d1/8a0d4292aff1fdba2f9c1ddf50c3b4ad11d5f590bd18d30869e42e2b6df1/jupyter-book-0.4.1.tar.gz#sha256=51e85701ee0d5b61c941b912f6016a7faf30352eefc4bc5db23f3d35a0193948 (from https://pypi.org/simple/jupyter-book/) (requires-python:>=3.4), version: 0.4.1
    Found link https://files.pythonhosted.org/packages/b1/17/9fefb60e72cada2b091feed18ebd8f3a978123c252bf9f7d78c5e0c9f794/jupyter_book-0.4.1-py3-none-any.whl#sha256=ecfee9fb2dcd23a693f9b076feef389de0dd2795db1043c200698e868e6b5c8c (from https://pypi.org/simple/jupyter-book/) (requires-python:>=3.4), version: 0.4.1
  Using version 0.4.1 (newest of versions: 0.4.1)
  Created temporary directory: /tmp/pip-unpack-vh3b6hqw
  Downloading https://files.pythonhosted.org/packages/b1/17/9fefb60e72cada2b091feed18ebd8f3a978123c252bf9f7d78c5e0c9f794/jupyter_book-0.4.1-py3-none-any.whl (3.7MB)
  Downloading from URL https://files.pythonhosted.org/packages/b1/17/9fefb60e72cada2b091feed18ebd8f3a978123c252bf9f7d78c5e0c9f794/jupyter_book-0.4.1-py3-none-any.whl#sha256=ecfee9fb2dcd23a693f9b076feef389de0dd2795db1043c200698e868e6b5c8c (from https://pypi.org/simple/jupyter-book/) (requires-python:>=3.4)
  Saved /tmp/tmpbx9gfxff/jupyter_book-0.4.1-py3-none-any.whl
  Added jupyter-book==0.4.1 from https://files.pythonhosted.org/packages/b1/17/9fefb60e72cada2b091feed18ebd8f3a978123c252bf9f7d78c5e0c9f794/jupyter_book-0.4.1-py3-none-any.whl#sha256=ecfee9fb2dcd23a693f9b076feef389de0dd2795db1043c200698e868e6b5c8c to build tracker '/tmp/pip-req-tracker-lwwhx8dj'
  Removed jupyter-book==0.4.1 from https://files.pythonhosted.org/packages/b1/17/9fefb60e72cada2b091feed18ebd8f3a978123c252bf9f7d78c5e0c9f794/jupyter_book-0.4.1-py3-none-any.whl#sha256=ecfee9fb2dcd23a693f9b076feef389de0dd2795db1043c200698e868e6b5c8c from build tracker '/tmp/pip-req-tracker-lwwhx8dj'
Skipping jupyter-book, due to already being wheel.
Cleaning up...
  Removing source in /tmp/pip-wheel-gl_dg797/jupyter-book
Removed build tracker '/tmp/pip-req-tracker-lwwhx8dj'