# A for loop is used to unpack the data in a format we choose.įor name, _, pop, area, (latitude, longitude) in metro_areas: Code is below: # Variable with City, Year, Population, and in a Tuple Coordinates Here I'll give a brief example of Nested Tuple unpacking by showing an example of City, Year, Population and the Latitude, Longitude coordinates within a nested tuple. If you have any questions, please feel free to comment or post your code ! In the next post we will cover Nested Tuple unpacking and round it up for this Ep series with Named Tuples. This is conceptually called parallel assignment, we can also use the * to be assigned to exactly 1 variable in any place here is an example of that : > Another example of tuple unpacking is prefixing an argument with a * when calling a function here are some examples below: > # Using * to grab excess items The only requirement is that the iterable yields exactly one item per variable. Tuple unpacking works with any iterable object. Here are some more examples and a jump into Tuple unpacking ! > # Here we assigned the variables in a single statement Here we are not interested in the second item, so it’s assigned to _, a dummy variable. The for loop knows how to retrieve the items of a tuple separately this is called “unpacking”. The % formatting operator understands tuples and treats each item as a separate field. Below is an example of using a for loop to > The first variable is the Latitude & Longitude information for Mt Rushmore, The second is statistical information on Warsaw, Poland, The third is the Country and Country Code pairs. Below are some examples of tuples being used as records: > # Variables for coordinates and other statistical info But when using a tuple as a collection of fields, the number of items is often fixed and their order is always vital. If you think of a tuple just as an immutable list, the quantity and the order of the items may or may not be important, depending on the context. Tuples hold the data for one field and the position of the item gives its meaning. Tuples do double-duty: they can be used as immutable lists and also as records with no field names. So we talked about tuples as “immutable lists”, but that is short selling them. But what about this unpacking? What's it about?Ī: I will cover more on unpacking and it's use in a post below ! We will use Tuple as records and storing coordinates and other cool things ! Q: Yeah, that's kind of what I expected, Kinda boring. > #You can assign multiple variables at once > LevelOne = 'Kreestuh', 'Wendell', 'Grizzle' > # Follow all elements except the last element with a comma Here are some examples: > # Create a Tuple The values need not all be of the same type. They are used everywhere in Python, because they allow for patterns that are hard to reproduce in other languages. So, a tuple is similar to a constant list. Unlike lists, tuples are immutable, meaning you can’t add, delete, or change items after the tuple is defined. Tuple( 'item',) Similar to lists, tuples are sequences of arbitrary items. Why cover them?Ī: There is a purpose for Tuples, this is where we get our start and go in-depth !Ī tuple is specified as a comma-separated list of values, which may be enclosed in parentheses. Q: I heard Tuples are pretty basic, similar to a List without all the features.
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