Why Every Software Tester Should Learn Python in 2026

# pip install requests pytest   Run: pytest -q
import requests

BASE = "https://jsonplaceholder.typicode.com"

def test_get_post_ok():
    r = requests.get(f"{BASE}/posts/1", timeout=10)
    assert r.status_code == 200
    assert {"id", "title", "body", "userId"} <= r.json().keys()

def test_missing_post_404():
    r = requests.get(f"{BASE}/posts/999999", timeout=10)
    assert r.status_code == 404

def test_create_post_201():
    r = requests.post(f"{BASE}/posts", json={"title": "qa", "body": "x", "userId": 1}, timeout=10)
    assert r.status_code == 201
    assert r.json()["title"] == "qa"

import pytest
import requests

BASE = "https://jsonplaceholder.typicode.com"

@pytest.mark.parametrize("user_id", [1, 2, 3, 4, 5])
def test_user_has_valid_email(user_id):
    r = requests.get(f"{BASE}/users/{user_id}", timeout=10)
    assert r.status_code == 200
    email = r.json()["email"]
    assert "@" in email and "." in email.split("@")[1]

# pip install pytest-playwright && playwright install
# Run: pytest -q
from playwright.sync_api import Page, expect

def test_valid_login(page: Page):
    page.goto("https://the-internet.herokuapp.com/login")
    page.get_by_label("Username").fill("tomsmith")
    page.get_by_label("Password").fill("SuperSecretPassword!")
    page.get_by_role("button", name="Login").click()
    expect(page).to_have_url("https://the-internet.herokuapp.com/secure")
    expect(page.locator("#flash")).to_contain_text("You logged into a secure area")

from playwright.sync_api import Page

class LoginPage:
    URL = "https://the-internet.herokuapp.com/login"

    def __init__(self, page: Page):
        self.page = page

    def open(self):
        self.page.goto(self.URL)

    def login(self, user: str, password: str):
        self.page.get_by_label("Username").fill(user)
        self.page.get_by_label("Password").fill(password)
        self.page.get_by_role("button", name="Login").click()

# In a test:
# lp = LoginPage(page); lp.open(); lp.login("tomsmith", "SuperSecretPassword!")

import csv
import random
import string

random.seed(1)

def make_user(i: int) -> dict:
    name = "".join(random.choices(string.ascii_lowercase, k=6))
    return {"username": f"{name}{i}", "email": f"{name}{i}@example.com",
            "age": random.choice([17, 18, 60, 61, 30])}   # include boundaries

users = [make_user(i) for i in range(20)]
with open("test_users.csv", "w", newline="") as f:
    w = csv.DictWriter(f, fieldnames=users[0].keys())
    w.writeheader(); w.writerows(users)
print("created", len(users), "test users")

import re
from collections import Counter

log = """2026-11-05 10:00:01 INFO login ok user=a
2026-11-05 10:00:05 ERROR payment timeout order=101
2026-11-05 10:01:12 ERROR payment timeout order=102
2026-11-05 10:02:30 WARN slow response 2300ms
2026-11-05 10:03:00 ERROR null pointer in cart service"""

errors = [line for line in log.splitlines() if " ERROR " in line]
types = Counter(re.sub(r"\S+=\S+", "", e.split("ERROR ")[1]).strip() for e in errors)
for msg, n in types.most_common():
    print(f"{n}x {msg}")

Week 1  Python basics: variables, lists, dictionaries, loops
Week 2  Functions, files, error handling
Week 3  pytest: tests, assertions, fixtures
Week 4  requests: API tests, parametrised cases
Week 5  Playwright or Selenium basics
Week 6  Page objects and stable locators
Week 7  Test data and log scripts; Git
Week 8  CI pipeline and portfolio README

Project: Python test suite for a public demo app

- tests/api: 15 API tests with pytest + requests
- tests/ui: 5 UI tests with Playwright, page objects
- utils/: test data generator and log analyser
- CI workflow running tests on every push
- README: what is covered, how to run, sample report

[ ] Write and run pytest tests
[ ] Use assertions with clear messages
[ ] Parametrise tests for many inputs
[ ] Call APIs with requests and check JSON
[ ] Automate one UI journey without sleeps
[ ] Generate test data with a script
[ ] Push work to GitHub and run it in CI