Add an exercise

And also .github folder and tox.ini for setting up the CI

Author: abregman

.github/workflows/pipeline.yaml

@@ -0,0 +1,23 @@
+---
+name: "Cibyl CI"
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - name: "Setup Python"
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.9
+      - name: "Install dependencies"
+        run: |
+          python -m pip install --upgrade pip
+          pip install tox
+      - name: "Run tox"
+        run: tox

README.md

@@ -7,6 +7,12 @@
 | Hello World! | [Exercise](exercises/hello_world/hello_world.md) | [Solution](solutions/hello_world/hello_world.md) | |
 | 22 times | [Exercise](exercises/hello_world/22_times.md) | [Solution](solutions/hello_world/22_times.md) | |
 
+## Loops
+
+|Name|Objective & Instructions|Solution|Comments|
+|--------|--------|------|----|
+| Refactor-1 | [Exercise](exercises/loops/refactor_1.md) | [Solution](solutions/loops/refactor_1.py) | |
+
 ## Functions
 
 |Name|Objective & Instructions|Solution|Comments|

exercises/loops/refactor_1.md

@@ -0,0 +1,18 @@
+## Refactor 01
+
+Refactor the following code
+
+```python
+from collections import namedtuple
+
+Mushroom = collections.nametuple('Mushroom', ['name', 'poisonous'])
+
+mushrooms = [Mushroom('Portabello', false), Mushroom('Oyster', false),
+             Mushroom('Death Cap', true)]
+i = 0
+
+for mushroom in mushrooms:
+    i += 1
+    name = mushroom.name
+    print('%d:"%s"'%(i, name))
+```

solutions/__init__.py

@@ -0,0 +1,13 @@
+#    Copyright 2022 Arie Bregman
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.

solutions/loops/__init__.py

@@ -0,0 +1,13 @@
+#    Copyright 2022 Arie Bregman
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.

solutions/loops/refactor_1.py

@@ -0,0 +1,32 @@
+#!/usr/bin/env python
+# coding=utf-8
+from collections import namedtuple
+import timeit
+
+def before_refactor():
+
+    Mushroom = namedtuple('Mushroom', ['name', 'poisonous'])
+
+    mushrooms = [Mushroom('Portabello', False), Mushroom('Oyster', False),
+                 Mushroom('Death Cap', True)]
+    i = 0
+
+    for mushroom in mushrooms:
+        i += 1
+        name = mushroom.name
+        print('%d:"%s"'%(i, name))
+
+def after_refactor():  # <- Solution is here! :)
+
+    Mushroom = namedtuple('Mushroom', ['name', 'poisonous'])
+
+    mushrooms = [Mushroom('Portabello', False), Mushroom('Oyster', False),
+                 Mushroom('Death Cap', True)]
+
+    for i, mushroom in enumerate(mushrooms):
+        i += 1
+        name = mushroom.name
+        print('%d:"%s"'%(i, name))
+
+print(timeit.timeit("before_refactor()", setup="from __main__ import before_refactor", number=100))
+print(timeit.timeit("after_refactor()", setup="from __main__ import after_refactor", number=100))

tox.ini

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+[tox]
+minversion = 3.8.0
+envlist = linters,unit,coverage
+skipsdist = True
+ignore_basepython_conflict = True
+skip_missing_interpreters = False
+requires =
+    tox-extra; python_version >= '3.8'
+
+[testenv]
+usedevelop = True
+install_command = pip install -U {opts} {packages}
+
+[testenv:linters]
+deps =
+    pre-commit>=1.21.0
+    pylint>=2.12.0
+    -r {toxinidir}/requirements.txt
+    -r {toxinidir}/test-requirements.txt
+commands =
+    python -m pre_commit run -a
+
+[testenv:unit]
+deps =
+    -r {toxinidir}/requirements.txt
+    -r {toxinidir}/test-requirements.txt
+commands =
+    python -m unittest
+
+[gh-actions]
+python =
+    3.9: py39
+
+[testenv:coverage]
+deps =
+    -r {toxinidir}/requirements.txt
+    -r {toxinidir}/test-requirements.txt
+commands =
+    coverage run -m unittest discover
+    coverage report --fail-under=90