I don't get the "while True: print("i dont get it")" please explain

Question

there are times in the quiz here, i could see "while True: print(smthng)" or even "while False: print(smthng)". what is the value of True and False there? There were no prior assignment statement in the code. please help

Answer 1

We use While True: when we don't know exactly how many times loop is going to iterate. When we have condition something like this while True: or while False: it usually have if condition and break statement in it. See below example

While True:
number = input ("Guess the Number")
If (input == "5"):
break
else:
print (number)

Above program continues to run untill user enter 5. When if condition becomes true with the help of break statement it will jump out of the while loop.

Answer 2

You should review this answer, which explains their initial values, where they come from, that they can have values reassigned...etc.

http://stackoverflow.com/a/2764099/3981745

Also note that it can help to think of True as 'something there' (like a number other than 0) and False as 'truly nothing' (just 0). For example, this works like True:

while "string that isn't empty":
loops forever : there's something there

and this conditional like False:

while "":
never executes : nothing there

Answer 3

To better understand this, lets replace True with a variable that takes a boolean value so that the statement reads while (var): print("blah"). If your variable was true, then the while loop will go until something changes your variable to false.

Just explicitly stating True after the while statement is just that, it's just not being passed through a variable. That means while True: will always run the loop. Likewise, while False: will never run the loop.