How Python Helps You Land a Software Tester Job Faster

import csv, re

EMAIL = re.compile(r"^[^@\s]+@[^@\s]+\.[^@\s]+$")
bad = []
with open("users_export.csv", newline="") as f:
    for row in csv.DictReader(f):
        if not EMAIL.match(row["email"]):
            bad.append(row["user_id"])
print(len(bad), "invalid emails:", bad[:10])

import pandas as pd

old = pd.read_csv("report_build_41.csv")
new = pd.read_csv("report_build_42.csv")
merged = old.merge(new, on="order_id", suffixes=("_old", "_new"))
diff = merged[merged["total_old"] != merged["total_new"]]
print(len(diff), "orders changed between builds")
print(diff[["order_id", "total_old", "total_new"]].head())

# pip install requests pytest
import requests

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

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

def test_missing_post_returns_404():
    r = requests.get(f"{BASE}/posts/99999", timeout=10)
    assert r.status_code == 404

import pytest, requests

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

@pytest.mark.parametrize("post_id", [1, 2, 3, 50, 100])
def test_posts_exist(post_id):
    r = requests.get(f"{BASE}/posts/{post_id}", timeout=10)
    assert r.status_code == 200
    assert r.json()["id"] == post_id

# pip install faker
import csv
from faker import Faker

fake = Faker("en_IN")
edge_names = ["", "A", "x" * 256, "O'Brien", "नमस्ते", "<script>"]
with open("test_users.csv", "w", newline="", encoding="utf-8") as f:
    w = csv.writer(f)
    w.writerow(["name", "email", "city"])
    for _ in range(50):
        w.writerow([fake.name(), fake.email(), fake.city()])
    for name in edge_names:
        w.writerow([name, fake.email(), fake.city()])

import re
from collections import Counter

pattern = re.compile(r"ERROR\s+(\w+)")
counts = Counter()
with open("app.log", encoding="utf-8") as f:
    for line in f:
        m = pattern.search(line)
        if m:
            counts[m.group(1)] += 1
for error, n in counts.most_common(10):
    print(f"{error:30} {n}")

python-tester-portfolio/
├── tests/
│   ├── test_api.py
│   └── test_exports.py
├── tools/
│   ├── make_test_data.py
│   └── log_summary.py
├── conftest.py
├── requirements.txt
└── README.md

import os
import pytest

@pytest.fixture(scope="session")
def base_url():
    return os.environ.get("BASE_URL", "https://jsonplaceholder.typicode.com")

# Python for testing — portfolio
What it shows:
- API tests with pytest and requests (positive and negative)
- Export validation scripts
- Test data generator with edge cases
- Log error summary tool
Run: pip install -r requirements.txt && pytest -q