Export App Store and Google Play reviews to Excel and find the top complaints
Disclosure: I built the reviews scraper used in this post and earn money when people run it. The pandas part works with reviews from any source. App…
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JobSpy doesn't scrape company career sites. Add Greenhouse, Lever and Workday jobs in the same DataFrame
JobSpy (speedyapply/JobSpy on GitHub) is a popular Python library for job search data (about 4,500 GitHub stars): one scrape_jobs() call returns Lin…
From Raw Hourly Data to a Validated Model: A Pandas and scikit-learn Walkthrough
Hourly time-series data rarely arrives clean. Hours go missing, timestamps repeat, sensors report impossible values, and some series start years aft…
pandas pct_change and cumsum: Percent Change and Running Totals
By Michael Nocito , data analyst · Published August 8, 2026 By the end of this page you can turn transactions into a monthly series, add period-on-p…
pandas merge: Left Join, Inner Join, and the One That Doubled the Revenue
By Michael Nocito , data analyst · Published August 8, 2026 By the end of this page you can attach columns from one DataFrame to another on a shared…
Handling Missing Values in pandas: dropna, fillna and What Each One Claims
By Michael Nocito , data analyst · Published August 8, 2026 By the end of this page you can count what is missing and where, choose between dropping…
pandas GroupBy: How to Summarize a DataFrame Without Losing Track of Your Rows
By Michael Nocito , data analyst · Published August 7, 2026 By the end of this page you can take a DataFrame, summarize it by any column or combinat…
How SQL and Python Work Together in Data Analysis
Every data analyst job posting asks for SQL and Python. That raises an honest beginner question nobody seems to answer directly. If both work with d…
One Bug Hit 11 Rows. Another Hit 36 Million.
I built a predictive maintenance model on 37,164,054 telemetry records from an iron ore mine. Six months of alarms from haul trucks and excavators.…
Pandas vs Polars: Which One Should You Use in 2025?
Pandas vs Polars: Which One Should You Use in 2025? You’re probably still typing df.groupby() in Pandas while your Polars-using teammate has already…
From Raw Prices to Real Signals: Financial Metrics for a Data Pipeline (Daily Return, MA, RSI, MACD, Volatility)
In this article I will share my understanding and use of some financial metrics used in my Financial Dashboard project. You can see it in this link…
# Turning Data Quality Checks into a Measurable Trust Score
Most data quality problems do not announce themselves loudly. They do not always break a pipeline. They do not always throw an exception. They do no…
Openpyxl's Relevance for Freelance Data Cleaning and Automation in 2023: Addressing Concerns and Solutions
Introduction: The Question of Relevance Imagine you’re a college student, fresh off mastering pandas , and you’re eyeing the freelancing market for…
Я спарсил 62 000 Python-вакансий с hh.ru и узнал страшное
Привет, Хабр! (И тебе, HR, который ставит в вакансию «Python, SQL, Linux, Docker, K8s, Spark, Airflow, английский C1, опыт 1-3 года, зарплата 40-60К…