Squashed 'tutorial/' content from commit d96a3c3

git-subtree-dir: tutorial
git-subtree-split: d96a3c3

.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+.hypothesis/
+.pytest_cache/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# pyenv
+.python-version
+
+# celery beat schedule file
+celerybeat-schedule
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+
+# MS VS Code
+.vscode/

.travis.yml

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+# ref : Francesco Mosconi, Travis + Anaconda + Jupyter, https://github.com/ghego/travis_anaconda_jupyter
+#       Anaconda Inc., Using conda with Travis CI, Conda documentation, https://conda.io/docs/user-guide/tasks/use-conda-with-travis-ci.html
+#       .travis.yml for gcc-5 compiler support on Travis CI , https://gist.github.com/cotsog/3ce84675af0d74438d91
+#       CodeChat, .travis.yml - Travis CI configuration, https://pythonhosted.org/CodeChat/.travis.yml.html
+#       Travis CI, Python example (unsupported languages), https://docs.travis-ci.com/user/multi-os/#python-example-unsupported-languages
+
+language: shell
+
+matrix:
+  include:
+    - env: CONDA_PYTHON=3.7.1
+      os: osx
+    - env: CONDA_PYTHON=3.7.3
+      os: linux
+    - env: CONDA_PYTHON=3.7.3
+      os: osx
+    - env: CONDA_PYTHON=2019.07
+      os: windows
+    - env: CONDA_PYTHON=2019.07
+      os: linux
+    - env: CONDA_PYTHON=2019.07
+      os: osx
+    - env: CONDA_PYTHON=nightly
+      os: linux
+  allow_failures:
+    - os: windows
+  fast_finish: true
+
+before_cache:
+  - rm -rf $HOME/miniconda/locks $HOME/miniconda/pkgs $HOME/miniconda/var $HOME/miniconda/conda-meta/history $HOME/miniconda/envs/test-environment/conda-meta/history $HOME/miniconda/lib/python3.6/__pycache__ $HOME/miniconda/lib/python3.7/__pycache__;
+  - touch $HOME/miniconda/conda-meta/history;
+
+cache :
+  directories:
+    - $HOME/download
+    - $HOME/miniconda
+    - $HOME/AppData/Local/Temp/chocolatey
+
+before_install:
+  # When C++14 support becomes more clear, consider revision
+  # https://docs.travis-ci.com/user/multi-os/
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
+      sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test;
+      sudo apt-get update -qq;
+    fi
+  - . tests/before_install_nix_win_cache.sh
+
+install:
+  # When C++14 support becomes more clear, consider revision
+  # https://docs.travis-ci.com/user/multi-os/
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
+      sudo apt-get update;
+      sudo apt-get install -qq g++-6;
+      sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-6 90;
+    fi
+  - . tests/install_nix_win_cache.sh
+
+# https://lord.io/blog/2014/travis-multiple-subdirs/
+script: cd tests && travis_wait 40 py.test --numprocesses=auto