labs/Module-2/1.Basic/07-Sets and Booleans.ipynb

Set and Booleans

There are two other object types in Python that we should quickly cover: Sets and Booleans.

Sets

Sets are an unordered collection of unique elements. We can construct them by using the set() function. Let's go ahead and make a set to see how it works

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x = set()

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# We add to sets with the add() method
x.add(1)

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#Show
x

Note the curly brackets. This does not indicate a dictionary! Although you can draw analogies as a set being a dictionary with only keys.

We know that a set has only unique entries. So what happens when we try to add something that is already in a set?

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# Add a different element
x.add(2)

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#Show
x

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# Try to add the same element
x.add(1)

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#Show
x

Notice how it won't place another 1 there. That's because a set is only concerned with unique elements! We can cast a list with multiple repeat elements to a set to get the unique elements. For example:

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# Create a list with repeats
list1 = [1,1,2,2,3,4,5,6,1,1]

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# Cast as set to get unique values
set(list1)

Booleans

Python comes with Booleans (with predefined True and False displays that are basically just the integers 1 and 0). It also has a placeholder object called None. Let's walk through a few quick examples of Booleans (we will dive deeper into them later in this course).

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# Set object to be a boolean
a = True

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#Show
a

We can also use comparison operators to create booleans. We will go over all the comparison operators later on in the course.

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# Output is boolean
1 > 2

We can use None as a placeholder for an object that we don't want to reassign yet:

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# None placeholder
b = None

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# Show
print(b)

Thats it! You should now have a basic understanding of Python objects and data structure types. Next, go ahead and do the assessment test!

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