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Posted Thu 27 Nov 2025 04:30:00 PM Tags: /tags/assignment /tags/cs2613 /tags/python

Before the Lab

Read
Practical Python on Testing (mainly the part on pytest, at the end).

Questions

Time: 5 Minutes
Activity: Group discussion

Questions about Quiz 2?

Getting Started

Make a directory ~/cs2613/labs/L14
Download Work.zip and unzip in your newly created directory.

Mortgage Calculator

Time: 20 Minutes
Activity: Modify given program

Do exercises 1.7 and 1.8 from Python Numbers

Introduction to Python strings

Time: 20 Minutes
Activity: Experiment in Python REPL

Do exercises 1.13, 1.14, 1.15 from Python Strings

Pytest

Time: 10 minutes
Activity: Demo

In a terminal run

  pipx install --include-deps unb-cs2613
  rehash

Save the following sample code (based on Exercise 1.19) to a file listex.py in the directory you created above.

symbols = 'HPQ,AAPL,IBM,MSFT,YHOO,DOA,GOOG'
symlist = symbols.split(',')

def test_lookup0():
    assert symlist[0] == 'HPQ'

def test_lookup1():
    assert symlist[1] == 'AAPL'

In ~/cs2613/labs/L14, run
```
  pytest listex.py
```
You should see

[student@id414m22 L14]$ pytest listex.py
=================== test session starts ===================
platform linux -- Python 3.9.18, pytest-7.4.3, pluggy-1.3.0
rootdir: /home1/ugrad/student/cs2613/labs/L14
plugins: pylama-8.4.1, cov-4.1.0
collected 2 items

listex.py ..                                        [100%]

==================== 2 passed in 0.02s ====================

Modify one of the tests so it fails. Run pytest again.
Question for your journal: what are three ways failing tests are indicated?

Lists and Pytest

Time: 20 minutes
Activity: Individual programming from template

For each of the remaining interactive evaluations in Exercise 1.19, add a corresponding test to listex.py.
make sure each test_* function (def) has a unique name.
if you want, you can have multiple asserts in a single test.
Questions for your journal:
- what are some differences between == in JavaScript and Python?
- based on what you have seen so far, what are similarities and differences between the node test framework and pytest

Functions and coverage

Time: 20 minutes
Activity: Individual programming, modify previous solution

We have already been using python functions for pytest, without really thinking about how they work. In Part 1.7 of Practical Python, functions are explained.

Consider the sumcount function

def sumcount(n):
    '''
    Returns the sum of the first n integers
    '''
    total = 0
    while n > 0:
        total += n
        n -= 1
    return total

Make a recursive version of this function.
Add sufficient pytest tests for both versions of the function.
Check your test(s) for coverage with
```
  pytest --cov=sum --cov-report=term-missing sum.py
```
(assuming your file is called sum.py)

Before next lab

Read