Using Python's in-built methods for string formatting

Question

I am trying to print a dictionary values

sales_record = {
'price': 3.24,
'num_items': 4,
'person': 'xyz'}

sales_statement = 'sales_record['person'] got sales_record['num_items'] item(s) at a cost of sales_record['price']each for a total of sales_record['price']*sales_record['num_items']'

print(sales_statement)

But this is simply giving me error

 File "<ipython-input-48-9c532ca6dcd1>", line 6
    sales_statement = 'sales_record['person'] got sales_record['num_items'] item(s) at a cost of sales_record['price']each for a total of sales_record['price']*sales_record['num_items']'

eumiro · Accepted Answer · 2019-08-10 17:57:41Z

2

If you are using a recent version of Python (3.6 or newer), replace that line with:

sales_statement = f"{sales_record['person']} got {sales_record['num_items']} item(s) at a cost of {sales_record['price']} each for a total of {sales_record['price']*sales_record['num_items']}"

answered Aug 10, 2019 at 17:57

eumiro

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Comments

Óscar López · Accepted Answer · 2019-08-10 18:05:31Z

1

You need to format your string. This will work for new and older versions of Python:

sales_statement = "{} got {} item(s) at a cost of {} each for a total of {}".format(sales_record['person'], sales_record['num_items'], sales_record['price'], sales_record['price'] * sales_record['num_items'])

edited Aug 10, 2019 at 18:05

answered Aug 10, 2019 at 17:59

Óscar López

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Comments

Isin Altinkaya · Accepted Answer · 2019-08-10 17:59:56Z

0

It is basically because of the quotes.

sales_statement = str(sales_record['person']) + " got " + str(sales_record['num_items']) + " item(s) at a cost of " + str(sales_record['price']) + " each for a total of " +  str(sales_record['price']*sales_record['num_items'])

answered Aug 10, 2019 at 17:59

Isin Altinkaya

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Deepstop · Accepted Answer · 2019-08-10 18:06:47Z

0

You can use double quotes for the full string and single quotes for the dictionary keys so that there is no confusion between them. In Python 3.6 or later. you can use f-strings and enclose the variables in curly braces, by preceding the string with the letter f. Prior to that you would have used the format string method.

sales_record = {
    'price': 3.24,
    'num_items': 4,
    'person': 'xyz'
}

sales_statement = f"{sales_record['person']} got {sales_record['num_items']} item(s) " \
                + f"at a cost of {sales_record['price']} each for a total of " \
                + f"{sales_record['price'] * sales_record['num_items']}"

print(sales_statement)

answered Aug 10, 2019 at 18:06

Deepstop

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