Python Variables

MOHAMMAD ALI ASHRAF
MOHAMMAD ALI ASHRAF
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Transcript
00:00of f. So, in the output here you can see the beginning the first 800 it comes for the first
00:12and the second line of the statement ok. You are assigned the value of f as 800 you are
00:19printing the value of f here. So, that is the first 800.
00:23Now, you see you are defining some function for the global f and you are asking to print
00:30the value of f. So, again the first value of f will be declared that is the second 800
00:36which is appearing here on the screen ok. Now, you are secondly you are assigning the
00:43value of f to some other statement. For example, here is change of global variable that is
00:49from 800 it is coming to change of global variable. You are ending the function and
00:56you are asking them to print the function of the print the value of f. So, that is when
01:02the change of global variable appears. So, this is how the global and variable function
01:08local and global variable works. It could be altered in any way you want you can declare
01:15it inside the function, outside the function and that is where the local and global variable
01:21stands.
01:22Now, how do you delete a variable? We can delete python variable using the command del
01:30ok and the variable name. So, basically this is how you can delete you can print you can
01:37use the function del and the particular variable or something that you want to delete. So,
01:43we have an example we deleted for example, if I write a program and I want to delete
01:49the variable g ok. So, we I can say del g and definitely that will be deleted. So, this
01:57is how it is I am assigning a value for example, g is equal to 24 ok. I am asking them to print
02:03the value of g. Later on I am asking them to delete the value of g and then the and
02:09then to print the value of g. So, you can see 24 has been declared because
02:16I am asking them to print the value of g and then I am asking them to delete the value
02:21of g. So, that is when you will find an error command called as trace back because you are
02:26deleting the value of g and you are getting this error called name error name g is not
02:32defined because you are asking them to print the value of g and plus you are at the same
02:37time you are asking them to delete the value of g. So, that is when you get this kind of
02:42output where g is not defined. So, these are all some examples you can just
02:48install pycharm you can implement your own simple codes like this try to run it for your
02:54better understanding of how local and global variable work, how you can delete, how you
02:59can declare variables, how you can reuse variable. So, with this you can understand the basics
03:04of the how programming of python language works for this pycharm.
03:10With this I conclude this session. Thank you so much.
03:14Thank you so much.
03:34Hello everyone. Welcome to this session about Python variable. We will be learning how we
03:39are using different types of variables, data types and how the values can be stored or
03:46reused all these kind of functions we will be learning here in this lesson.
03:51So, basically coming to the introductory part about variable a python variable is a reserved
03:58memory location which helps us to store values and the next is about the python variable
04:05type. Now, every value in a python has a data type. So, different data types that are
04:11available in python here you can see as numbers, list, tuples, then strings, dictionary etcetera
04:19all these are variables in python that can be declared by a name, by a alphabet etcetera.
04:26Now, how to declare and use a variable? Basically we are declaring a variable say example x,
04:33y, tall depends and then you are assigning a value to it that is how you declare and
04:40assign a value to a variable. Now, re-declaring a variable is nothing but even if you in a
04:46program if you have used a variable say a and you have assigned a value to that variable
04:53a after some time after some path of that program or after some function if you want
04:59to reuse it, it is possible. So, these are some of the main things that you need to understand
05:05about the python variable. Now, I will later on in the coming slides you will understand
05:10how I have structured the declaring using of the variable and even reusing of the variable.
05:17So, now this is basically about declaring a variable. Now, what I have done here is
05:23I have taken a variable a and I have assigned a variable called 5000 a value to that particular
05:30variable say 5000. Now, I am assigning a value to that variable and I am asking the program
05:39to print the value of that variable. So, if a is equal to 5000 here which is a variable
05:47a and I am asking to print the value of a you are getting the output as 5000 that is
05:55you are declaring a variable, you are assigning a variable and you are printing the value
06:00of a. So, this is just a basic example of how you declare a variable.
06:06Now, coming to the next session that is re-declaring of the variable ok. Again now I am taking
06:13the variable a here ok I have assigned the value 5000 to the variable a. Now, what I
06:20am doing is I am printing that particular value of a. So, this is the first part here
06:26a is equal to 5000 you are printing the value of a. So, definitely 5000 has been given as
06:35output. Now, again you are reusing the same variable that is a is being used again and
06:42you are assigning something to that a. So, here I am using dollars and I am asking to
06:49print that particular a. So, definitely 5000 and dollars would be printed as output. So,
06:56this is how you can reuse or re-declare the variable.
07:01Now, coming to the next section that is Python string concatenation and variables. So, basically
07:07concatenation is you are combining the two words or strings or anything together. So,
07:13now, I am assigning two variables here that is a and b. So, for a I am assigning one value
07:21for b I am assigning other value and I am asking the function here concatenation function
07:28here to be operated and to print them together. So, for that I am using print function of
07:35the variable a plus the string that is the value of b. So, Grishma and 88 when it is
07:44concatenated together when you are asking the print function of a plus b you are getting
07:50Grishma 88. So, this is how the concatenation program works.
07:56Now, what is local and global variable? When we want to use the same variable for the rest
08:04of the program or a module we declare it as a global variable. For example, on our previous
08:11program we were declaring a single variable a ok. So, that has been assigned as a global
08:18variable because you are reusing it. So, when we want to use the same variable for the rest
08:24of the program we are declaring it as a global variable. When we want to use the variable
08:30in a specific function or a method we call it a local variable. So, when you want to
08:37use that particular variable for a particular function or a method under some function or
08:43method we mention it as local variable. So, now let us define a variable in python
08:50where the variable f is global in scope and we are assigning a value 800 and we are asking
08:58it to print the output. So, this you can see in upcoming slides. Now, variable f is again
09:04declared in a function and we can use it as assume or we can assume it as local scope. So,
09:12where you give something for example, I have given I love learning python. So, this is used
09:18as a local part local variable and then we are getting it as an output. So, let us see how it
09:25looks like. So, now here f I am taking a variable f I am assigning the value 800 to it and I am
09:33asking the print function to print the value of f. So, now that is the globalized here f is used
09:42as a global function. Now, when I am using it under some function or some method that f becomes
09:50a local variable. So, now define I am defining some function here that is a function here and
09:56I am stating f is equal to I love learning python. So, you are printing basically only the value of
10:04f that is assigned as a local variable and then again after the function ends you are asking them
10:11to print the function of f which has been assigned for a global variable. So, that is why in the
10:19output here you can see 800 printed twice because I am using the print function twice here. At the
10:27beginning stage I am asking the print f function again. So, that the f variable can be declared
10:33again and after the function has ended where the function is working for I love learning python
10:40after that function has ended I am again asking them to declare the value of f which has been
10:46previously assigned. So, that is how you get 800 twice and the local variable f that is I love
10:53learning python has been printed as local variable of f. So, this is one of the example here. Now,
11:02while python variable declare declaration using the low keyword global we can even reference the
11:09global variable inside a function. So, do not assume that one if you are using a variable inside
11:16the function it is local and one that is not there in the function it is global. No, there could be
11:21scenarios where the global function or the variable can be even declared globally inside a function.
11:28The variable f is global in scope and is assigned a value 800 which is printed in output ok. Now,
11:35variable f declared using keyword global this is not a local variables, but the same global
11:42variable declared earlier. Hence, we print its value the output as 800. Now, we change the value
11:50of f inside the function once the function call is over the change value of the variable f persist
11:58ok. So, this is again another example of how the global variable can be used inside a function. So,
12:05you can see the function here ok. I am taking the variable f here which is assigned 800 and I am
12:13printing that function f ok. I am printing the value of the variable f. Now, I am using some
12:21function here ok and I am asking them to print the value of f again. Why? Because it is because
12:30it has been declared global. So, then I am assigning one more value for the variable f
12:36that is change of global variable and I am asking them to print the function of f.
12:42So, in the output here you can see the beginning the first 800 it comes for the first and the
12:50second line of the statement ok. You are assigned the value of f as 800 you are printing the value
12:57of f here. So, that is the first 800. Now, you see you are defining some function ok for the
13:04global f and you are asking to print the value of f. So, again the first value of f will be declared
13:11that is the second 800 which is appearing here on the screen ok. Now, you are secondly you are
13:19assigning the value of f to somebody.