Homework4

.github/workflows/main.yml

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+# This is a basic workflow to help you get started with Actions
+
+name: CI
+
+on: push
+
+jobs:
+  code_quality:
+    runs-on: ubuntu-latest
+    name: Checks with black, isort and possibly run tests
+    container: python:3.9
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Run script
+        run: |
+          pip install flake8 isort pytest
+          pip install requests
+          ls -la
+          flake8 .
+          isort --check .
+          py.test tests

homework4/task01.py

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+"""
+Write a function that gets file path as an argument.
+Read the first line of the file.
+If first line is a number return true if number in an interval [1, 3)*
+and false otherwise.
+In case of any error, a ValueError should be thrown.
+
+Write a test for that function using pytest library.
+You should create files required for the testing inside the test run and
+remove them after the test run.
+(Opposite to previous homeworks when you used files created manually
+before the test.)
+
+Definition of done:
+ - function is created
+ - function is properly formatted
+ - function has positive and negative tests
+ - tests do a cleanup and remove remove files generated by tests
+
+You will learn:
+ - how to test Exceptional cases
+ - how to clean up after tests
+ - how to check if file exists**
+ - how to handle*** and raise**** exceptions in test. Use sample
+ from the documentation.
+
+* https://en.wikipedia.org/wiki/Interval_(mathematics)#Terminology
+** https://docs.python.org/3/library/os.path.html
+*** https://docs.python.org/3/tutorial/errors.html#handling-exceptions
+**** https://docs.python.org/3/tutorial/errors.html#raising-exceptions
+"""
+
+
+def read_magic_number(path: str) -> bool:
+    try:
+        with open(path, 'r') as file:
+            line = file.readline()
+        return 1 <= float(line) < 3
+    except BaseException:
+        raise ValueError

homework4/task02.py

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+"""
+Write a function that accepts an URL as input
+and count how many letters `i` are present in the HTML by this URL.
+
+Write a test that check that your function works.
+Test should use Mock instead of real network interactions.
+
+You can use urlopen* or any other network libraries.
+In case of any network error raise ValueError("Unreachable {url}).
+
+Definition of done:
+ - function is created
+ - function is properly formatted
+ - function has positive and negative tests
+ - test could be run without internet connection
+
+You will learn:
+ - how to test using mocks
+ - how to write complex mocks
+ - how to raise an exception form mocks
+ - do a simple network requests
+
+
+>>> count_dots_on_i("https://example.com/")
+59
+
+* https://docs.python.org/3/library/urllib.request.html#urllib.request.urlopen
+"""
+
+import requests
+from requests import RequestException
+
+# i misunderstood that we can use any lib for this task
+
+
+def count_dots_on_i(url: str) -> int:
+    try:
+        r = requests.get(url)
+        return r.text.count("i")
+    except RequestException:
+        raise ValueError(f"Unreachable {url}")