Multiple conditions with and, or and not; truthy and falsy values

Real decisions often depend on more than one fact, so Python lets you combine conditions with the logical operators and, or and not. a and b is true only when both are true. a or b is true when at least one is true. not a flips a value. For example, if age >= 18 and has_ticket: requires both, while if day == "Sat" or day == "Sun": accepts either. These are keywords, written in lower case; the symbols &&, || and ! from other languages are not valid Python.