Real Dev (@realdev9868)

Python's mutable default argument bug, run one call at a time

Why a list default keeps growing between calls, how to see it with __defaults__, the None fix, and two places the same bug hides.

6 min readrealdev9868.hashnode.dev

Oct 27

The Python Copy Bug That Looks Fine in Code Review

A shallow copy, a shared inner list, and a deepcopy fix, with every snippet run on Python 3.13 and the real output pasted.

6 min readrealdev9868.hashnode.dev

Oct 20

Pandas Basics on a Real Dataset: A Hands-On Walkthrough with Palmer Penguins

Load, inspect, clean, filter, group and pivot real data with pandas. Every snippet was run and the outputs are real.

7 min readrealdev9868.hashnode.dev

Oct 19

Belady's Anomaly: FIFO vs LRU vs Optimal, Checked in Python

A GATE CS page-replacement walkthrough on one reference string, plus a script that shows how rare Belady's anomaly really is.

6 min readrealdev9868.hashnode.dev

Oct 17

A 30-Day DSA Plan for Placements, Built Around Patterns (Not Problem Counts)

A common way to prepare for placement coding rounds is to open a list of hundreds of problems and start at number one. A month later, a new problem still feels like a blank page. A better approach: le

7 min readrealdev9868.hashnode.dev

Oct 15

Real Dev

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Real Dev's blogs

Python's mutable default argument bug, run one call at a time

The Python Copy Bug That Looks Fine in Code Review

Pandas Basics on a Real Dataset: A Hands-On Walkthrough with Palmer Penguins

Belady's Anomaly: FIFO vs LRU vs Optimal, Checked in Python

A 30-Day DSA Plan for Placements, Built Around Patterns (Not Problem Counts)

Real Dev

About

Available for

Real Dev's blogs

Python's mutable default argument bug, run one call at a time

The Python Copy Bug That Looks Fine in Code Review

Pandas Basics on a Real Dataset: A Hands-On Walkthrough with Palmer Penguins

Belady's Anomaly: FIFO vs LRU vs Optimal, Checked in Python

A 30-Day DSA Plan for Placements, Built Around Patterns (Not Problem Counts)

Real Dev

About

Available for

Real Dev's blogs

Python's mutable default argument bug, run one call at a time

The Python Copy Bug That Looks Fine in Code Review

Pandas Basics on a Real Dataset: A Hands-On Walkthrough with Palmer Penguins

Belady's Anomaly: FIFO vs LRU vs Optimal, Checked in Python

A 30-Day DSA Plan for Placements, Built Around Patterns (Not Problem Counts)

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Real Dev

About

Available for

Real Dev's blogs

Python's mutable default argument bug, run one call at a time

The Python Copy Bug That Looks Fine in Code Review

Pandas Basics on a Real Dataset: A Hands-On Walkthrough with Palmer Penguins

Belady's Anomaly: FIFO vs LRU vs Optimal, Checked in Python

A 30-Day DSA Plan for Placements, Built Around Patterns (Not Problem Counts)