Lesson 4 — Exceptions

Handle failures

An exception is Python signalling that something went wrong, like dividing by zero. try/except catches it so your program keeps running. Name the error type after except, so only that problem is handled and other errors still surface.

try:
    age = int("twenty")
except ValueError:
    print("Please type a number")

Why it matters: user input and network calls fail all the time, and catching the right exception keeps the app usable.