WHILE loops

301.10 Iteration

Iteration — Note 2 of 4

Repeat while condition true.

What you need to know

A while loop repeats as long as its condition is True. The condition is checked before each iteration. Use it when you don't know in advance how many times to loop.

What to know

while condition: repeats while True
Condition checked before each iteration
Must update something to eventually make condition False
If condition never becomes False → infinite loop

Code examples

WHILE loop

python

password = ""
while password != "secret":
    password = input("Enter password: ")
print("Access granted")

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Specification notes for programming are in Paper 2.