FAQ: Learn Python- Loops - Looping over a dictionary

Frequently Asked Questions Python FAQ
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This community-built FAQ covers the “Looping over a dictionary” exercise in Codecademy’s lessons on Python.

FAQs for the Codecademy Python exercise Looping over a dictionary:

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2 posts were split to a new topic: Why doesn’t the code just print out in order that it is written in the dictionary?

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Why does it print the dictionary out in this order:
a apple
c cherry
b berry

I can’t find any reason why it would print it out in that order, and not just like this:
a apple
b berry
c cherry

1 Like
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Unlike list objects that have an ordered index, dictionaries do not have an index, and no order is maintained. Keys can be in any order.

1 Like
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How do you then, print it out in an order? Is it for example possible to print out the keys from left to right, just as they have been written into the dictionary?
So for example:

d = {g: [“hey”], j:[“everyone”], y:[“here”]}

1 Like
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Without calling upon the Collections library for the OrderedDict class (Google this and bookmark it for later), we can sort the keys and and iterate over them to print out the dictionary in that order.

>>> d = {'g': ['hey'], 'j':['everyone'], 'y':['here']}
>>> d
{'j': ['everyone'], 'y': ['here'], 'g': ['hey']}
>>> for key in sorted(d):
	print ("{}: {}".format(key, d[key]))

	
g: ['hey']
j: ['everyone']
y: ['here']
>>>
3 Likes