FAQ: A Day at the Supermarket - Investing in Stock

Frequently Asked Questions Python FAQ
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This community-built FAQ covers the "Investing in Stock " exercise from the lesson “A Day at the Supermarket”.

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FAQs on the exercise _Investing in Stock _

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" Create a stock dictionary with the values below.

py “banana”: 6, “apple”: 0, “orange”: 32, “pear”: 15

What does the “py” mean here ? I didn’t know so I didn’t include it, and the code ran well. Then I included it and I got a suntax error.

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The same question from me. I have identical situation. mynameismisterg did you sort it out?

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py was placed in the instruction by mistake. Omit it.

1 Like
5

Perhaps we’ll learn this later, and if so, “just keep going, you’ll learn it later” will be an acceptable answer, but if not:

Would there be a way to make a dictionary with multiple keys so we don’t have to list the fruit over and over every time we want to give it a new property? Something like, for example:

multikey_product_list = { "product 1": item_number : 8675309 price : 5.00 "product 2": item_number : 4567891 price : 5.99 }

If so, that’d be snazzy. If not, oh well.

Thanks for any insight, I’m enjoying my time here so far :slight_smile:

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6

I may be misunderstanding your query but it’s perfectly valid to nest containers so you could have a dictionary where the values of that dictionary were each themselves dictionaries.

data = {
    'a': {1: 'red', 2: 'blue', 3: 'green',},
    'b': {0: 'black', 5: 'red', 3: 'green',},
}

Nesting too deeply can be rather difficult to understand and use after a while though. If you find yourself adding structures within structures always take a moment to see if there’s a better option. A few other containers might be suitable for this purpose too, or you might decide to rewrite part of it using new objects with the class keyword.

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7

I suspected classes might be a suggested answer, I have heard of them before. I might play around with your suggestion later and see how useful that is for what I was imagining. Thanks for a response. :slight_smile:

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