WEBVTT

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In this session, we will discuss about dictionaries dictionary is an unordered collection of key value

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pairs with unique piece.

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These are unique within a dictionary, while the values may defeat.

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The values of a dictionary can be of any data, while the keys must be awful, immutable data such as

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string numbers or doubles.

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Let us see how we can create a dictionary.

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Let us start by creating a dictionary so we can create a dictionary.

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By simply giving you the name, say.

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They one.

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And to create a dictionary, we need the holy places inside the holy places, we will provide the key

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value pairs separated by a comma.

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So we will give the first key, which could occur key can have values like strength numbers or double.

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So let us play the string.

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Same name.

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And the value.

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Will be, let us say, Munsie.

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We separated, we see each.

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And the age is say.

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Twenty seven VCM.

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Plus.

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That is given the number of this, say, 12.

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And the value can be anything.

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So let us give it a value as a list.

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Now we can have Cappadocia, so let us.

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Played, you sort of have any values, say, one, two, three, and the value will be one.

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So here we have.

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A key value pair with a key is name a string, the device and the value is, again, a string device.

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The next one is a piece with string and value as no key, and we have key as no value as a list here.

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We have key as a couple and value as a number.

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Let me run this and let us see the dictionary.

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So here you can see we are able to create this dictionary.

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Now, if you try to create, you can have values as boolean values.

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So here I have just created a boolean value.

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Now let's try to have a key value pin, which is maybe a list.

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Azadeh, so let us read this and let the value of one.

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Now, when we run this, you can see the it gives a bipod error, that is the type is unmatchable because

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Alist cannot be a part of the key.

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So we can simply remove this now.

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Let us create another dictionary.

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And we will try different operations on the Pacific.

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So let's create a dictionary of.

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A person.

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C student.

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And.

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Let us create the dictionary.

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With.

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Name.

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As John.

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Ange.

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14.

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Then we can have.

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Other details.

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Like.

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School.

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And this is say.

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ABC.

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So this is the dictionary which we have created and we can print it using STOO.

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Now if I want to print a particular value from it.

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So remember that a dictionary is unordered in nature.

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So if I try to pull something like.

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One so.

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It will not doing anything because this is not a valid key, what did XM expect?

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Here is a key, a key that you have created.

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You will have to input that here.

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So we will put let's same school.

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So if you run this, you will get the value of the school.

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Similarly.

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If you run this with.

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Aneesh, we will get the value of each.

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Now, let's say we want to retrieve all the elements from this particular.

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Dictionary, then what we can do is we can send see student items and when we done this, we get the

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entire value set present in this particular dictionary.

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So it returns a list.

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All couples, these are the couples, one couple containing key value, next.

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The bill, again, contains a key on its value.

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Now, let us say we want to retrieve a particular.

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Key out of this, so what we can do is for this weekend, statically see.

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S.T. Hill, he's.

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And it will give me the list of the Indiagames similarly, I can see CD on values and it will give me

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the list of all the values which are present now as we have these.

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And let us say we want to create a new key value pair, then we can simply cease to and inside this

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we can create a new pieszecki.

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And I can assign the value to it, see value.

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So now, if I didn't do so, you can see a new P-value beard has been added with.

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You can see once we have done this, so I knew he was Lupin has been added that he is taken from here

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and this is the value which we have just assigned.

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Now, let us see how we can delete a particular key value fish.

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So let me, first of all, bring the student for you so.

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Savi.

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And we can get value by using.

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He.

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So this is the key value pair now, if I want to believe this, I can simply say delete and it will

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delete this particular key.

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Now, if I look up the dictionary.

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Here you can see the value is not available now.

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And in case I want to remove the entire dictionary, then I can simply say dill stew and if they leave

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the dictionary, so now, if you will, to try to access the dictionary.

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It will give an order that is the means do is not defined.

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Now let us recreate the dictionary.

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So let us recreate this dictionary now.

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So this is the collegiate dictionary, which we have the now let's say we want to read on top of this

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dictionary, then what we can do is we can simply say for.

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Gyi and.

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The one that is the dictionary.

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Trent.

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So this gives me different values.

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Now let me try to get the key and the items so that I can do simply by.

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So this gives me the key and relevant.

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Now let us say we want to trade on top of both key in value and we don't really want to use this particular

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structure because we might not really know which dictionary we are working on.

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So we can simply use the same thing.

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But the difference will be now we will try to get more value here.

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So now we will be trading on the dictionary items so that items.

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Now, what does dictionary those items give us?

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So let us see what the one item will give us.

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So this gives us the Thumper's that is the key and the corresponding value on the key, on its corresponding

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value and so on.

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So then we will be getting the values.

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This will be.

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In fact, so we will get key karma value from it, so instead of using this, we can simply say value

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and this will bring the key and value the.

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So this is how we can access elements from a dictionary and use it in a for loop, so always remember,

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if you want to access a particular dictionary, then we will be using keys for accessing the dictionary.

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So whenever we will be looping on a dictionary, it will loop on the keys.

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So we will get keys here and then we can decode corresponding key and values.

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Now is we are moving on the items.

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This means that we are looping on this particular list of papers which contains key and value mode.

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So it will be unpacked and we get key and value in this particular order, only that the values will

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always be the first one which we will be getting would be key.

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And the second one which we will be getting is the value.

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So this is about dictionaries.

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Thank you.