A 30-Day Prep Checklist That Actually Works Python has become the core skill for Data Analyst and Data Scientist roles. Yet, many candidates fail interviews not because they don’t know Python, but because they don’t prepare the right way. This article breaks down a 30-day, practical Python interview prep checklist focused specifically on Data Analyst / Data Science roles — not generic software engineering. 🔍 What Interviewers Really Test in Python (Data Roles) Before the checklist, let’s clarify what companies usually look for: ✔ Data manipulation skills ✔ Ability to clean messy datasets ✔ Logical thinking using Python ✔ Strong Pandas & NumPy foundations ✔ Clear explanation of approach (not just code) 📅 Week 1: Python Fundamentals (Days 1–7) Focus: Logic + Core Language Confidence 🔹 Data types (list, tuple, set, dict) 🔹 Loops & conditional logic 🔹 Functions & lambda expressions 🔹 List & dictionary comprehensions 🔹 is vs ==, mutabilit...