Скачать или смотреть Day 2 — Type Error, Type Checking & Type Conversion

Welcome to Day 2 of 100 Days of Code (Python)!
Today you’ll master Type Errors, Type Checking with type(), and Type Conversion/Casting using int(), float(), str(), and bool(). We’ll demystify why len(123) throws a TypeError and how to fix it, plus practical tips from IDE hints to Python docs.

What you’ll learn

Why len() expects a Sized object (e.g., string/list) and fails on int

IDE hints (e.g., PyCharm: hover to see expected types)

Type checking with type("Hello"), type(42), type(3.14), type(True)

Casting: when to use int(), float(), str(), bool()—and when it fails

Common pitfalls: "123" + "456" (concat) vs int("123")+int("456") (math)

Practice / Pause exercises

Fix the len() call by passing a string (e.g., "Hello")

Print the types of a string, int, float, and boolean

Challenge: Ask the user’s name and print:
Number of letters in your name: X (convert len(name) to str first!)

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