while loop will cause the loop statements to be executed until the loop condition is falsey. The following code will execute the loop statements a total of 4 times.
i = 0 while i < 4: #loop statements i = i + 1
While the above loop can easily be translated into a more elegant
while loops are useful for checking if some condition has been met. The following loop will continue to execute until
myObject is ready.
myObject = anObject() while myObject.isNotReady(): myObject.tryToGetReady()
while loops can also run without a condition by using numbers (complex or real) or
import cmath complex_num = cmath.sqrt(-1) while complex_num: # You can also replace complex_num with any number, True or a value of any type print(complex_num) # Prints 1j forever
If the condition is always true the while loop will run forever (infinite loop) if it is not terminated by a break or return statement or an exception.
while True: print "Infinite loop" # Infinite loop # Infinite loop # Infinite loop # ...