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- [Instructor] We have two self check

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exercises for you here on tuples.

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In the first one, we'd like
you to create a single element

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tuple that just contains the
floating point value 123.45

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and display it, and in the
second one, we want you to

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test out what happens if you add together

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with the plus operator two
sequences of different types,

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which is something that I didn't

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actually mention in the preceding video.

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So give those a shot and then
come back for the answers.

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Okay, let's go ahead and reveal the

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answer here for the first exercise.

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Again, with a singleton
tuple, what defines this

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as a tuple is the comma,
not the parentheses,

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but we use the parentheses
for readability and emphasis.

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So let's just go ahead
and display the contents

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of that tuple after
creating it, and again,

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when it displays a
singleton tuple to emphasize

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that it is a tuple, not
just a value in parentheses,

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they put the comma at the
end of that one value.

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Now, in this second
exercise, we did not talk

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previously about the fact
that the plus operator

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requires two arguments of the same type.

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Now of course, it'll work
with a floating point number

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and an integer because
it can treat the integer

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as a floating point number in that case,

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but when it comes to
sequences being concatenated

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with the plus operator, you
can see that by executing this,

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we wind up with a type
error, indicating that

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you can only concatenate a list to a list.

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So it's making that decision
based on which type of object

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is on the left side of
the operator in terms of

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the error message that it's
actually displaying here.

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So for concatenating
data structures together,

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or sequences together, you
have to have two sequences

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of the same type, so that
would be of course two lists,

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two tuples, or two strings,
in which case the two strings'

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contents would be added
together or concatenated.