Reference library

Big data & Spark

PySpark jobs, partitioning, batch processing, and large-dataset transform patterns.

1 match
Big data & Spark medium

How to Implement row_number Window Function in Python

This code implements a SQL-style ROW_NUMBER() window function in pure Python, partitioning rows by a set of columns and ranking them within each partition by an ordered set of columns.

window-functions data-processing row-number
Python 
from collections import defaultdict
import itertools


def row_number(rows, partition_by, order_by):
    partitions = defaultdict(list)
    for index, row in enumerate(rows):
        key = tuple(row[col] for col in partition_by)
        partitions[key].append((index, row))

    result = []
    for key in partitions:
 …
17 0 Open

Browse by section

Each section groups closely related Python snippets.

Big data & Spark — Python code examples

What you will find here

This page collects big data & spark snippets — short, copy-ready Python you can paste into our free online IDE and run without installing anything. Each sample includes a plain-English explanation and the full source code.

Samples vs tutorials and challenges

Samples are quick reference — one concept per page. For step-by-step teaching, use our Python tutorials. To test yourself, try quizzes or coding challenges. Clean up style with the Python formatter.

Related coding tools

Free online Python IDE Write and run Python in your browser — no install. Free Python code formatter Format with autopep8 — side-by-side PEP 8 cleanup. Python code samples Copy-ready snippets to study and run in the IDE.