Create pre-commit hook for nbstripout

.gitignore

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+*.egg
+*.egg-info/
+*.eggs/
+*.pyc
+.*.swp
+.travis-solo/
+MANIFEST
+README.html
+__pycache__/
+build/
+dist/
+htmlcov/
+.coverage
+.idea/

.pre-commit-hooks.yaml

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+- id: nbstripout
+  name: Strip Outputs from Notebooks
+  description: Strip outputs from all new notebooks
+  entry: nbstripout
+  language: script
+  files: (^|/).+\.ipynb$

nbstripout.sh

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+#!/bin/sh
+#
+# strip output of IPython Notebooks
+# add this as `.git/hooks/pre-commit`
+# to run every time you commit a notebook
+#
+# requires `nbstripout` to be available on your PATH
+#
+
+if git rev-parse --verify HEAD >/dev/null 2>&1; then
+   against=HEAD
+else
+   # Initial commit: diff against an empty tree object
+   against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
+fi
+
+# Find notebooks to be committed
+(
+IFS='
+'
+NBS=`git diff-index --cached $against --name-only --diff-filter=A | grep '.ipynb' | uniq`
+
+for NB in $NBS ; do
+    echo "Removing outputs from $NB"
+    nbstripout "$NB"
+    git add "$NB"
+done
+)
+
+exec git diff-index --check --cached $against --