from IPython.core.display import HTML
HTML('<img src="http://teaching.software-carpentry.org/wp-content/uploads/2012/09/ControlFlow.png" height="500px">')

basket = ["macintosh", "pink lady", "granny smith", "fuji", "spartan"]
for apple in basket : 
    print "I ate a " + apple 

while basket :
    print "I ate a " + basket.pop(0)

...

basket_dict = {"macintosh":2, "pink lady":1, "granny smith":3, "fuji":1, "spartan":3}
for variant, amount in basket_dict.iteritems():
    print "I ate " + str(amount) + " " + variant + "."

basket = ["macintosh", "pink lady", "granny smith", "fuji", "spartan"]

basket_dict = {"macintosh":2, "pink lady":1, "granny smith":3, "fuji":1, "spartan":3}
for variant, amount in basket_dict.iteritems():
    if amount > 1 :
       print "I ate " + str(amount-1) + " " + variant + "."

...

True == 1

True == 0

False == True

"macintosh" in basket_dict

"Ruby Red" in basket_dict

"macintosh" in basket_dict or "Ruby Red" in basket_dict

...