How to Convert a String to an Int in Python

Python is a dynamically typed language, which means variables don't need a declared type — but that flexibility comes with a catch. Data pulled from user input, files, APIs, or web forms almost always arrives as a string, even when it looks like a number. Before you can do any math or numerical comparison with it, you need to convert it explicitly. Here's how that works, where it gets tricky, and what factors shape the right approach for your situation.

Why Strings and Integers Are Different in Python

In Python, "42" and 42 are fundamentally different objects. The first is a string — a sequence of characters. The second is an integer — a numeric value you can perform arithmetic on.

Try adding them without conversion: