Contents

6. Loops

6.1 Overview

  • while

  • for

6.2 While

Syntax:

secret = 'swordfish'
pw = ''
while pw != secret:
    pw = input("What's the secret word? ")

6.3 For

Syntax:

animals = ( 'bear', 'bunny', 'dog', 'cat', 'velociraptor' )
for pet in animals:
    print(pet)

6.4 Additional Loop Controls

  1. continue: to shortcut a loop (as if it had reached the end)

  2. break: to break out of the loop prematurely

  3. else: only if the loop ends normally (not if a break is used)

Example: 

secret = 'swordfish'
pw = ''
auth = False
count = 0
max_attempt = 5
while pw != secret:
    count += 1
    if count > max_attempt:
        print("calling the FBI")
        break
    if count == 3:
        # skip 3rd attempt but continue loop
        continue
    pw = input(f"{count}: What's the secret word? ")
else:
    print('Authorized')
5. Operators 7. Functions