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…
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How to Connect Python to a SQL Database (Straight Into a DataFrame)
By Michael Nocito , data analyst · Published August 8, 2026 By the end of this page you will run a SQL query from Python and get back a pandas DataF…
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…
Шиномонтаж методом Симпсона: как красивая статистика чуть не убила премиум-сервис
Что делать, если средний чек премиального автосервиса оказался в 4 раза меньше планового? Первое «очевидное» решение руководства — немедленно избави…
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.…
Handling Pandas NaN Values in FastAPI JSON Responses
Handling Pandas NaN Values in FastAPI JSON Responses ===================================================== When building APIs with FastAPI and worki…
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…
Как я устал от фейковых скидок на Wildberries и написал парсер для аналитики цен на спортпит
Хабр, Привет! Пожать заветную сотку, добрать белка, закрыть углеводное окно и просто попозировать после тяжелой потной тренировки — всё это не&…
Pandas vs SQL, when to use each
Pandas and SQL do a lot of the same things: filter rows, group, aggregate, join. So analysts reasonably ask which to learn and when to use which. Th…
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…
Как за один вечер я написал сервис инвентаризации оргтехники для филиальной сети из 16 локаций
Знакомая работает в IT-департаменте организации с 16 филиалами и ~5000 единиц оргтехники на балансе. Попросила: “Сделай сервис, чтобы загрузить фотк…
Ускоряем и оптимизируем numpy, pandas, scipy и sklearn
С момента публикации статьи на Хабре « Импортозамещаем numpy, pandas, scipy и sklearn » прошло почти три года. В течение этого времени я приостанови…
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…
Analyzing Steam Games 2025: Genres, Players and User Ratings
As part of my Master in Data Science & AI at Evolve , I worked on a data analysis project using a real Steam games dataset from 2025. The goal o…