Using a while loop as a wait in python

Question

I have done this in C/C++ before where I have a while loop that acts as a wait holding the program up until the condition is broken. In Python I am trying to do the same with while(GPIO.input(24) != 0): and its says that it is expecting an indent. Is there anyway to get the script to hang on this statement until the condition is broken?

Answer 1

Do note that an empty while loop will tend to hog resources, so if you don't mind decreasing the time resolution, you can include a sleep statement:

while (GPIO.input(24) != 0):
    time.sleep(0.1)

That uses less CPU cycles, while still checking the condition with reasonable frequency.

Answer 2

In Python, you need to use the pass statement whenever you want an empty block.

while (GPIO.input(24) != 0):
    pass