Python 3 Sets - Frozensets

Python 3: From Scratch to Intermediate BEGINNER LEVEL: Python 3 - Sets
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Transcript

We have discussed sets and the corresponding set methods. But what is a frozen set? Well, remember I said that sets are immutable, meaning they can be modified by adding or removing an element. As we've seen earlier, frozen sets are nothing more than immutable sets. The elements of a frozen set remain the same after creation. Due to this feature.

Frozen sets can be used as elements of another set or as a key in a dictionary. And don't worry, if you don't know what a Python dictionary is yet, we will discuss dictionaries pretty soon in the course. To prove the immutability of frozen sets. Let's create one and see what we are allowed to do with it and what is forbidden. Let's consider lists one and two. This is list one, and this is list two.

Now let's create our frozen sets by passing these lists to the frozen set function. So let's say Fs one Equals frozen set of list one and Fs two equals frozen set of lists to. Finally, let's check if we have indeed created two frozen sets. So let's check Fs one. Okay, and Fs two. Also, let's check type of Fs one.

And it is of class frozen set. Okay, so we have frozen sets confirmed. Now let's try to add or remove an element from Fs one. For instance, let's say Fs one dot add 10. And we get an attribute error frozen set object has no attribute add. Okay, maybe we can remove an element.

So let's say Fs one dot remove an element one. Again, we have an attribute error telling us that the frozen set object has no attribute remove. What about Fs? One dot pop? Nope, bad luck again. What about maybe Fs one dot clear.

And again, we receive the same error. If we check Fs one again, you can see that no modifications have been applied on this frozen set. Of course, operations like difference, intersection and union are still available since they're not attempting to modify the content or structure of frozen sets. So let's check this real quick. Let's say Fs one dot intersection with Fs two. And indeed, we have three and four being the common elements of these two frozen sets.

Next, let's try Fs one dot difference from Fs two. And indeed, elements one and two are not part of frozen set two, which is correct. And finally, Fs one dot union with Fs two, and we get a frozen set containing all the elements of both frozen set one and frozen set two. That's about it regarding sets and frozen sets to data types that will definitely come in handy someday.

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