X, y and y, are true / false conditions that are used to turn on and turn off leds. If x is true, then a set of two leds (connected in parallel) will be lit. If y is true, then another set of two leds will be lit. If z is true, then a set of four leds (connected in parallel) will be lit. Therefore if x, y, and z are all true, then a total of 8 leds will be lit.
Answers
Answer:
Step-by-step explanation:
There are three logical operators, and, or, and not, that allow us to build more complex Boolean expressions from simpler Boolean expressions. The semantics (meaning) of these operators is similar to their meaning in English. For example, x > 0 and x < 10 produces True only if x is greater than 0 and at the same time, x is less than 10.
n % 2 == 0 or n % 3 == 0 is True if either of the conditions is True, that is, if the number n is divisible by 2 or it is divisible by 3. (What do you think happens if n is divisible by both 2 and by 3 at the same time? Will the expression yield True or False? Try it in your Python interpreter.)
Finally, the not operator negates a Boolean value, so not (x > y) is True if (x > y) is False, that is, if x is less than or equal to y.
The expression on the left of the or operator is evaluated first: if the result is True, Python does not (and need not) evaluate the expression on the right — this is called short-circuit evaluation. Similarly, for the and operator, if the expression on the left yields False, Python does not evaluate the expression on the right.
So there are no unnecessary evaluations.
Hope it helps you...