Try Except.

Sixth class. Some errors are caught with try/except. Catch specific types — ValueError, TypeError — not a bare except:.

def parse_int(text): try: return int(text) except ValueError: return None

int("x") raises ValueError. You catch it and return None instead of crashing.

TypeError comes from incompatible types — for example "a" * "b". Note: 3 * "x" does not raise (you get "xxx"). Today we practise both.

Common mistake: bare except: — hides bugs; or wrapping too much code in one try.