CODEWITHSUNDEEP
pythonpython-3.x
Kifsif
Kifsif

Reputation: 3843

dict to simulate switch operator

In my textbook I read that a newbie needs some time to recognize this construction:

choice = 'ham'
print ({
    'spam': 1.25, 
    'ham': 1.99,
    'eggs': 0.99,
    'bacon': 1.10
}[choice])

With the result:

The result is 1.99

To tell the truth, I can't even grasp a tail of the knot to tell nothing of untying it. Could you clarify it to me a bit?

Upvotes: 2

Views: 224

Answers (2)

zeffii
zeffii

Reputation: 544

You might even stick a .get in there to return a value if the choice isn't in the dictionary.

mapping = {'spam': 1.25, 'ham': 1.99, 'eggs': 0.99, 'bacon': 1.10}
choice = 'beans'
price = mapping.get(choice, 'not listed')
print(price)

will return 

not listed

Upvotes: 3

Martijn Pieters
Martijn Pieters

Reputation: 1121486

It's a python dictionary literal, combined with a lookup using choice as a key:

mapping = {'spam': 1.25, 'ham': 1.99, 'eggs': 0.99, 'bacon': 1.10}
choice = 'ham'
price = mapping[choice]
print(price)

Upvotes: 5

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