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Challenge 134: Traveling Shopper

curriculum/challenges/english/blocks/daily-coding-challenges-python/691f7773cddba1caf1bf5ecd.md

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--description--

Given an amount of money you have, and an array of items you want to buy, determine how many of them you can afford.

  • The given amount will be in the format ["Amount", "Currency Code"]. For example: ["150.00", "USD"] or ["6000", "JPY"].
  • Each array item you want to purchase will be in the same format.

Use the following exchange rates to convert values:

Currency1 Unit Equals
USD1.00 USD
EUR1.10 USD
GBP1.25 USD
JPY0.0070 USD
CAD0.75 USD
  • If you can afford all the items in the list, return "Buy them all!".
  • Otherwise, return "Buy the first X items.", where X is the number of items you can afford when purchased in the order given.

--hints--

buy_items(["150.00", "USD"], [["50.00", "USD"], ["75.00", "USD"], ["30.00", "USD"]]) should return "Buy the first 2 items.".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(buy_items(["150.00", "USD"], [["50.00", "USD"], ["75.00", "USD"], ["30.00", "USD"]]), "Buy the first 2 items.")`)
}})

buy_items(["200.00", "EUR"], [["50.00", "USD"], ["50.00", "USD"]]) should return "Buy them all!".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(buy_items(["200.00", "EUR"], [["50.00", "USD"], ["50.00", "USD"]]), "Buy them all!")`)
}})

buy_items(["100.00", "CAD"], [["20.00", "USD"], ["15.00", "EUR"], ["10.00", "GBP"], ["6000", "JPY"], ["5.00", "CAD"], ["10.00", "USD"]]) should return "Buy the first 3 items.".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(buy_items(["100.00", "CAD"], [["20.00", "USD"], ["15.00", "EUR"], ["10.00", "GBP"], ["6000", "JPY"], ["5.00", "CAD"], ["10.00", "USD"]]), "Buy the first 3 items.")`)
}})

buy_items(["5000", "JPY"], [["3.00", "USD"], ["1000", "JPY"], ["5.00", "CAD"], ["2.00", "EUR"], ["4.00", "USD"], ["2000", "JPY"]]) should return "Buy them all!".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(buy_items(["5000", "JPY"], [["3.00", "USD"], ["1000", "JPY"], ["5.00", "CAD"], ["2.00", "EUR"], ["4.00", "USD"], ["2000", "JPY"]]), "Buy them all!")`)
}})

buy_items(["200.00", "USD"], [["50.00", "USD"], ["40.00", "EUR"], ["30.00", "GBP"], ["5000", "JPY"], ["25.00", "CAD"], ["20.00", "USD"]]) should return "Buy the first 5 items.".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(buy_items(["200.00", "USD"], [["50.00", "USD"], ["40.00", "EUR"], ["30.00", "GBP"], ["5000", "JPY"], ["25.00", "CAD"], ["20.00", "USD"]]), "Buy the first 5 items.")`)
}})

--seed--

--seed-contents--

py
def buy_items(funds, items):

    return funds

--solutions--

py
def buy_items(funds, items):
    rates = {
        "USD": 1.00,
        "EUR": 1.10,
        "GBP": 1.25,
        "JPY": 0.0070,
        "CAD": 0.75
    }

    amount, currency = funds
    money = float(amount) * rates[currency]

    for i, (item_amount, item_currency) in enumerate(items):
        item_cost_usd = float(item_amount) * rates[item_currency]

        if item_cost_usd > money:
            return f"Buy the first {i} items."

        money -= item_cost_usd

    return "Buy them all!"