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recommend to everyone and we we continue the

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python lessons for beginners in the last video we

00:00:34

looked in detail at how

00:00:36

tuples work in the python programming language

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in this video lesson we will move on and

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talk in detail about dictionaries word vodka

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one of the most commonly used

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data structures that allows you to store

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objects for access that use a

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key in a number of programming languages

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similar structures

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are dictionaries all sharp and associative

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arrays in php

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objects in java script in this lesson we

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will look in detail at the operations of creating

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deletion and in general working with dictionaries

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and their methods a dictionary is a

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data structure also called an

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associative array designed for

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storing arbitrary objects with

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access by key, the data in the dictionary

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is stored in a key-value format,

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if you remember such a structure as a

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list whose elements

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are accessed by an index, which is a

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non-negative integer, and we ourselves are

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not directly involved in creating the

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index in the dictionary and the analogue of the index

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is the key; in this case, you create the key

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on our own, let's take a deep

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dive into creating changes to deleting and

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working with dictionary elements. An

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empty dictionary can be created by specifying curly braces or using the dict function. Let's create the dkt variable and create our first dictionary accordingly. Duck t2. Let's try using the dict function. Here we have created two empty dictionaries.

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this is to check and display the type using the

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type function,

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let's open the terminal and as you can

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see, the data type is dict, respectively,

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if we put it like this, these two will be

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similar, it’s no secret if you

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want to create a dictionary with a pre-

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prepared data set, then you can

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use one of the ones I listed

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approaches but with a

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key-value enumeration and let's immediately, for example,

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create some kind of

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dictionary for example we have a key this

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will be the name John then you put

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a colon and put its value for

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example 35 then for example Alex example

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27 well and there is some kind -n I don’t know,

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let’s put 42 accordingly, here we have brought out

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our dictionary, let’s get it accepted,

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now it will look like this,

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everything is very simple, try it yourself, also

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practice, write down, be sure to

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write down,

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then to add a dictionary element,

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you need to specify a new key and its value,

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for example, let’s do this so

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then in square brackets we enter a

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new key for example Dima and then we enter

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its value for example and display it

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one more time in this glory so that you

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can see the difference in how it will look like

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in the second case our chest

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has been replenished with one

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more key Dima one more

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their meanings are numbers 12 in our dictionary, because

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strings are used as keys and

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numbers are used as values, but these are

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not necessarily keys and values must

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be of the same type, they can represent

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different types, well, for example, let’s enter

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a unit here, it can also be

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different data by value, and

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we can also here present other values

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and let's look at the result, well, as

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you can see, everything is displayed, everything

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works for us, to delete an element from the

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dictionary, you can use the

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to-do command and let's in this case delete

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some specific element of

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the examples, here we have the first one, respectively,

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let's see what now in in the second

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case, we won’t have it anymore because

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here we also enter this

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option with it and delete it, it

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will be immediately displayed and the value that

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we need without this first element, we’ve

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figured it out well, let’s talk a

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little about working with access dictionaries

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Dictionary elements are accessed in the same way as

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access to list elements, only

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we specify a key as an index

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and let's print edge for example, we will display

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the value for

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them by index alex in this case we

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see kiev everything is very simple,

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practice also with the rest if

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we see b m here accordingly, we

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will get the result that we need, everything is

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very simple, you can also check the

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presence of a key in the dictionary, this action

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is performed using the operator and, and

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let’s

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do it this way Prince,

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further here we see been in

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age and that the variable that contains

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our dictionary and in this case, it should

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display a corpse because b m element

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exists in this dictionary,

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and if we enter some other

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value, then we get

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falls, let's now talk about

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dictionary methods, delete this value, and

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for example, the first method will be the

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clear method, and here let's output

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this dictionary, respectively, now we

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would have an empty dictionary, the clear method

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deletes all elements of the dictionary, everything is very

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simple, let's create a variable h2

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and equate to it such a method as

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copies, respectively, let's delete, display

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edge 2,

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this method creates a new copy of the dictionary,

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accordingly, very simply, and and jones and

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stores accordingly this copy then the

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next method is the get method it

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returns the value from the dictionary by key

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in some cases there is such a

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need, let’s immediately follow the

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prince this method looks like this

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and for example we will display alex

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accordingly here we will also get the

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values of some bulkheads in some

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programs and we need to

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use the method, so pay

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attention to this, then the

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items function looks like this and here

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we are, in this case we will return the

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dictionary elements by key and value in a form

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formatted for us, let's output it

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and as you can see we see dict oh there,

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accordingly, here they are

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formatted and output then the

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next method is

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this function case it returns the keys of

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the dictionary let's also output it well and

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accordingly we displayed the dictionary keys here

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then the pop method looks like on the

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method in this way and for example here we

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want to output ben by the key ben

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accordingly if the key is in the dictionary then

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this element will be removed from the dictionary and

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the value will be returned if we further

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print and, accordingly, the key and

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value b will no longer be here if we

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use a similar function pop

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oh there it will delete and return the

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key-value pair from the dictionary

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in this case we will not get true,

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respectively, the last element, then

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the function plus, it returns the value of the

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elements of the dictionary, let's output this,

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respectively, MPa

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Chile 35 Kiev and the corpse, then comes the

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update function you will use in your

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work, for example, we have one dictionary

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and we know its keys,

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but we want to update its value to

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For example, here we are creating dictionaries number two

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with the variable h 2 and here we will

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also have for the first key

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not 35a 333, let’s say Alex, let’s say we are

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not in Kiev

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London, and we’ll add some other key,

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let’s say the target is 444 and add the

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values falls here,

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respectively, if We are the

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first to update our dictionary, the second, then we will get a

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more complete dictionary with new

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meanings, as if we were updated with the values with the

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first key, that is, now we do not have 35

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and 333, then also the Alex key

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has also been updated now, not Kifa London, we would

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have stayed like that because we didn’t

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update

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and we added here the keys 444 with

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the value falls, respectively, this is how

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it all works, while age 2

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will remain unchanged, let’s

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make sure of this, we will also have a

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dictionary like this for us,

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only the words speech are changed to which they are added

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elements of another dictionary,

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but if it is necessary that both source

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dictionaries remain unchanged and the result of the

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union is some 3 words, then

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you can first copy one

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dictionary to another and then assign the

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next one to the changes, so let’s

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move on to enumerating the elements to

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enumerate the dictionary, you can use the

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for loop basically, as you are already

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used to, let’s do this and

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leave one dictionary age, we use a for

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loop

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where we will use the key, then

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comes the keyword in and then comes

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the name of our dictionary by variable and

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accordingly, then we will bring it all,

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enter the key key, then we will put

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separating them, let's put a dash dash

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more precisely and here we write the name of

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our dictionary and in square brackets

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the values okay, let's see

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what we got, accordingly we

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went through our dictionary so it all

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works there

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is another way to iterate through elements

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it represents the use of the method

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this mts it needs a little change

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here here we put key and well you and

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then in each we put this function this

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accordingly and then here we can

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simply use the value of the

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blue variable, the same effect is obtained

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set to

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hedgehogs each crankcase contains the key and the

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value of the element which, when iterating over,

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we can immediately get in the variable

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kay

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and we'll and, accordingly, it looks like this,

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and there are also

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separate possibilities for enumerating keys and

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enumerating values to enumerate the keys, we

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can call the case method in the dictionary,

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respectively, here we change iTunes to

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case, and here, accordingly, we enter

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just kay only here do not forget to

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remove everything and we will get our result by

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keys search by keys and also in hp.

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let's name here well you,

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here we will also put well you

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and the function here will be in hp.

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accordingly, this is how we see the meanings,

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everything is very simple, here you also

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practiced and everything worked out for you,

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if it didn’t work out, write in the comments

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I will try to answer all the questions and that’s all,

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thank you all very much for your

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viewing, see you all again,

00:10:07

great luck and bye

Description:

Продолжаем подробное изучение программирования на Python для начинающих. Python легкий язык программирования и вся работа с различными типами данных тоже очень проста для любого новичка программиста. В этом видео мы пойдем глубже и рассмотрим все работу с типом данных словари в Python dict. Покажу все действия на простых примерах и задачах. Курс Python -https://skillfactory.ru/python-for-web-developers

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