The `while` statement, execution (2)

Example

# program with a while loop
n = 0
while n < 20:
  print n,
  n = n+1

Operation:

evaluate CONDITION, yielding TRUE or FALSE
if CONDITION is FALSE, exit the while statement, and continue the program below the while statement
if CONDITION is TRUE, execute STATEMENT1,..,STATEMENTn, and go back to step 1

The while statement, execution (2)