FAQ: Data Types - Boolean

This community-built FAQ covers the “Boolean” exercise from the lesson “Data Types”.

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FAQs on the exercise Boolean

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Can anyone tell me how I can input the Boolean on python to turn a system on and off. I would like SysON to be true an SysOff to be false. Would I enter it in that way or another way?

Are SystemOn and SystemOff specific commands to do something? I couldn’t find anything, so I made some up:

def SystemOn():
    print("True, so system is now on.")
def SystemOff():
    print("False, so system is now off.")

while True:
    prop = input("Enter a boolean proposition, such as 3>4. \nEnter q to quit\n")
    if prop == 'q':
    is_true = (eval(prop))
    if is_true:

If the user enters a statement that evaluates to True, function SystemOn() runs; if False, SystemOff() runs. The eval() function does the work.

HI, can anyone answer this question for me plz?
so, i get how we use numbers and strings, but what does exactly a boolean do?
it’s no where near clear to me !

Welcome to the forums!

A boolean can be used whenever we want to represent something that is on or off, true or false, etc. For example, what if we had a variable that represented the amount of money we had in our wallet and another variable that represented the price of a t-shirt? If we wanted to see if we had enough money to buy the t-shirt, we could store this result as a boolean. If we had enough money, we’d use true, and if not, we’d use false.

Another way booleans are very useful is in conditional statements. For example, if I have enough money, buy the t-shirt. You’ll learn more about these later in the course.


I am curious about the example used for the boolean “lightson”

It says, " Flip the switch to see the scene change from day to night and watch the lights turn on and off. Notice how the variable LightsOn stays the same, but its value changes from true to `false’ "


So why is it when the sun is out and there is daylight, the output for ‘lightson’ = false??? and vice versa for true and its night time???

Wouldn’t the daylight = true and night = false ?

Plz help.

Thank you

Welcome to the forums!

The “lights” that lightsOn refers to are the lights inside the house (off during the day, on at night).

Thank you for the prompt reply and the answer to something I didn’t catch LOL
Mil Gracias

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