Add bisect exercise

In this example we will be doing a bisect

.devcontainer/Dockerfile

@@ -0,0 +1,3 @@
+# [Choice] Python version (use -bullseye variants on local arm64/Apple Silicon): 3, 3.10, 3.9, 3.8, 3.7, 3.6, 3-bullseye, 3.10-bullseye, 3.9-bullseye, 3.8-bullseye, 3.7-bullseye, 3.6-bullseye, 3-buster, 3.10-buster, 3.9-buster, 3.8-buster, 3.7-buster, 3.6-buster
+ARG VARIANT=3-bullseye
+FROM mcr.microsoft.com/vscode/devcontainers/python:${VARIANT}

.devcontainer/devcontainer.json

@@ -1,5 +1,43 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.238.1/containers/python-3
 {
-    "image": "mcr.microsoft.com/devcontainers/base:ubuntu",
-    "postCreateCommand": "bash scripts/install.sh"
-  }
-
+  "name": "Python 3",
+  "build": {
+    "dockerfile": "Dockerfile",
+    "context": "..",
+    "args": {
+      // Update 'VARIANT' to pick a Python version: 3, 3.10, 3.9, 3.8, 3.7, 3.6
+      // Append -bullseye or -buster to pin to an OS version.
+      // Use -bullseye variants on local on arm64/Apple Silicon.
+      "VARIANT": "3.10-bullseye",
+      // Options
+      "NODE_VERSION": "none"
+    }
+  },
+  "customizations": {
+    "vscode": {
+      // Set *default* container specific settings.json values on container create.
+      "settings": {
+        "python.defaultInterpreterPath": "/usr/local/bin/python",
+        "python.linting.enabled": true,
+        "python.linting.pylintEnabled": true,
+        "python.formatting.autopep8Path": "/usr/local/py-utils/bin/autopep8",
+        "python.formatting.blackPath": "/usr/local/py-utils/bin/black",
+        "python.formatting.yapfPath": "/usr/local/py-utils/bin/yapf",
+        "python.linting.banditPath": "/usr/local/py-utils/bin/bandit",
+        "python.linting.flake8Path": "/usr/local/py-utils/bin/flake8",
+        "python.linting.mypyPath": "/usr/local/py-utils/bin/mypy",
+        "python.linting.pycodestylePath": "/usr/local/py-utils/bin/pycodestyle",
+        "python.linting.pydocstylePath": "/usr/local/py-utils/bin/pydocstyle",
+        "python.linting.pylintPath": "/usr/local/py-utils/bin/pylint"
+      },
+      // Add the IDs of extensions you want installed when the container is created.
+      "extensions": [
+        "ms-python.python",
+        "ms-python.vscode-pylance"
+      ]
+    }
+  },
+  "postCreateCommand": "bash scripts/install.sh",  // Comment out to connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+  "remoteUser": "vscode"
+}

scripts/create_example_7.sh

@@ -0,0 +1,59 @@
+#!/bin/bash
+
+pushd examples
+git init example_7
+cp ../template/add.py example_7/add.py
+cp ../template/check_function.sh example_7/check_function.sh
+
+pushd example_7
+
+# Initial commit
+git add add.py
+commit_msg="Add bisect exercise
+
+In this example we will be doing a bisect, there will
+be a very long history, where you will not be able to
+tell from the commit message where a bug has been
+introduced, however at one point the python function has
+changed from returning a + b -> a * b, your task is to
+use bisect to figure out in which commit that happened
+
+You have a helper script, check_function.sh which you
+can use to determine if the commit is good or bad."
+
+git commit -m "$commit_msg"
+
+last_var="<random>"
+random_commits=$(( $RANDOM % 2000 + 500 ))
+# Add random text
+for ((i=1;i<=$random_commits;i++))
+  do
+    var=$RANDOM
+    sed -i "s/$last_var/$var/" add.py
+    git add add.py
+    git commit -m "$var"
+    last_var=$var
+  done
+
+sed -i "s/[+]/*/" add.py
+git add add.py
+
+commit_msg="$RANDOM
+
+Congratulations, you found me"
+
+git commit -m "$commit_msg"
+
+
+random_commits=$(( $RANDOM % 2000 + 500 ))
+for ((i=1;i<=$random_commits;i++))
+  do
+    var=$RANDOM
+    sed -i "s/$last_var/$var/" add.py
+    git add add.py
+    git commit -m "$var"
+    last_var=$var
+  done
+
+popd
+popd

scripts/install.sh

@@ -7,3 +7,4 @@ mkdir examples
 ./scripts/create_example_3.sh
 ./scripts/create_example_4.sh
 ./scripts/create_example_5.sh
+./scripts/create_example_7.sh

template/add.py

@@ -0,0 +1,14 @@
+#!/usr/bin/env python
+
+import sys
+
+
+def add(a, b):
+    return a + b  # <random>
+
+
+if __name__ == "__main__":
+    result = add(2, 3)
+    if result == 5:
+        sys.exit(0)
+    sys.exit(f"Wrong result, should be 5, is {result}")

template/check_function.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+python add.py