Python Conditional Loops

MOHAMMAD ALI ASHRAF
MOHAMMAD ALI ASHRAF
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Transcript
00:00Welcome to this session. In this session we will be going about the conditional loops
00:15if nested if break statement all these kind of things we will be going into the conditional
00:20loops of pythons in this coming session. So, we will move to the python conditional loops.
00:26Next one is about the if statement it performs different computations or actions depending
00:31on whether a specific Boolean constraint evaluates to true or false ok. So, basically we need
00:39to assign whether a statement is true or false. So, the conditional statements are handled
00:44by if statement in python. Now, if statement is used for decision making
00:49operations and this is the syntax here if you are giving an expression you are giving
00:54a statement if that statement does not matches we give else and under statement. So, for
01:02that we have else condition and elif condition. Else condition when we have to judge one statement
01:09on the basis of other we use else condition. Elif is to correct the previous error made
01:16by the else condition ok. By using elif condition we are telling the program to print out the
01:22third condition or possibility when the other condition goes wrong or is incorrect. So,
01:30this is the if statement. Now, nested if statement this is an example
01:35where you are using lot of ifs ok. So, just see into the program here and we are using
01:41lot of if conditions you can see if country, if total you are asking you are using elif
01:47if total then again you are using elif then again you are asking if country if total.
01:52So, this is the nested if statement that means, you are giving lot of conditions if this if
01:58condition a does not happen condition b if condition b does not work out condition c
02:04condition d and you are giving elif also that means, if a is not working then choose b.
02:10So, this is how a nested if statement looks like.
02:14Now, we will come to the switch case statement. A switch statement is a multi way branch statement
02:22that compares the value of a variable to the value specified in the case statement. Now,
02:29python language usually does not have a switch statement, python uses a dictionary mapping
02:35ok to element switch case in python. So, always remember it does not have switch statement
02:41just like we use in you know java and c language, but here it has a dictionary mapping which
02:47helps us to implement the switch case in the python language.
02:52Now, python for the for loop and the while loops. Loops can execute a block of code number
03:02of times until a certain condition is met. For loop is used to iterate over elements
03:09of a sequence. It is often used when you have a piece of code which you want to repeat
03:15n number of times ok. So, this is an example here for people who are familiar with the
03:22languages for c of c and java you know how you use the if for conditions here ok.
03:29So, just the same way here in python we are using for x in the range of 2 is to 7. So,
03:35that iteration keeps on happening till the value of x is printed. Now, in the case of
03:41while loop, while loop is used to repeat a block of code ok. Instead of running the code
03:47block once it executes the block of code multiple times until the certain condition is satisfied.
03:57Now for that the expression is while expression we are giving a while expression and a statement
04:04multiple times. Now, this is how here I have given a comparison for you guys about the python
04:10loop and the code working code of for all the exercises. Now, for while loop this is how the
04:18code works ok. We are giving x is equal to 0 and you are asking it to implement 4 times ok till
04:24what x is equal to x plus 1 and you are asking it to iterate it accordingly until the condition
04:33is satisfied. Now, for loop here we have as in the same way you know you are giving for x in
04:40the range of 2 comma 7 and you are printing the value of x. Now, for loop in a string that is we
04:50have the months here for example, January, February, March till June and you are printing
04:55the for m in months you are asking them to print the value of m. Now, using the break statement
05:02this is how you use the break statement that means, once the condition has been satisfied or
05:08met you break the statement that means, you want to exit the loop. So, for x in the range of 10
05:14comma 20 the loop the if condition keeps on happening and then you are giving a break
05:20statement and asking them to print the value of x. Now, use of continuous statement it is the same
05:27way you are using a given giving a condition or a loop condition you are stating that if
05:32your statement is so and so continue and then you are asking to print the x.
05:37Now, enumerate function, enumerate function is also you can see how it is being used with this
05:43it. So, these codes can help us help you to identify how they vary from each other the while,
05:51the for, loop, break statement, continuous statement, enumerate statement. So, all these
05:56are the examples you can take these examples and run the code by yourself and you can find
06:02out the answers. Now, python break statement. So, the break statement takes care of terminating
06:09the loop in which it is used. If the break statement is used inside the nested loop the
06:16current loop is terminated and the flow will continue with the code followed that comes
06:22after the loop. So, here you can see the code you have a variable or a condition it is given
06:30to a condition and it is given to a body of a loop if it works out fine again it goes to the
06:37condition if not it goes to the break we give a break statement end of a loop if it is false it
06:45goes back against the condition or it exist the exit the loop. So, this is how the outline
06:52structure looks like for a break statement. Now, continuous statement the same thing is
06:59that you are giving a loop test as expression then you have a condition to continue the next
07:05iteration if the iteration turns out to be false you are executing the remaining part of the loop.
07:11No, if the condition satisfies you go to the true statement and you test the loop condition. So,
07:18this is how the flowchart of the continuous statement looks like. Now, python pass statement
07:27ok. So, this is another one that is being used in python. Python pass statement is used as a
07:31placeholder inside the loop functions class if statement that must that is meant to be implemented
07:39later ok we use the syntax that is called pass. A comment can also be added inside the body of
07:46the function or a class, but the interpreter ignores the comment and will throw an error.
07:52The pass statement can be used inside the body of a function or a class body during the execution
07:59the interpreter when it comes across the pass statement ignores and continues without giving
08:05any error. Now, when to use a break and continue statement? A break statement when used inside the
08:13loop will terminate the loop and exit. If used inside the nested loop it will break out from
08:21the current loop. Now, continuous statement will stop the current execution when used inside a loop
08:28and the control will go back to the start of the loop. The main difference here between the break
08:34and continue statement is that when break keyword is encountered it will exit the loop always
08:41remember when you give the word break it will exit the loop. In case of continue keyword the
08:48current iteration that is running will be stopped and it will proceed to the next iteration. So,
08:56this is the basic difference between the break and the continue statement. Now, python oops that
09:03is object oriented where you are considering the class objects inheritance and constructor with we
09:10have constructors with example. Now, a class first we will come into the class a class in python is
09:17logical grouping of data and function ok. It gives the freedom to create data structures that
09:24contains arbitrary content and hence it is easily accessible. So, this is how you define a python
09:32class ok. You have the syntax here is class you give a class name and this is how it looks like.
09:37To make an object of a class we are assigning a variable c is equal to my class so and so. Now,
09:44to call a method in a class you are using c dot method one or like you know c dot method two and
09:51you are giving and you are assigning a variable. So, this is how the general syntax of a class
09:58looks like. Now, inheritance now a class first we will come into the class a class in python
10:09is logical grouping of data and function ok. It give the continue statement. Now,
10:16python oops that is object oriented where you are considering the class objects inheritance
10:22and you are assigning a variable c is equal to my class. So, this is how you define a class.
10:29Now, inheritance now a class first we will come into the class a class in python is logical
10:32grouping of data and function ok. It gives the freedom to create data structures that
10:38contains arbitrary content and hence it is easily accessible. So, this is how you define a python
10:46class ok. You have the syntax here is class you give a class name and this is how it looks like.
10:52To make an object of a class we are assigning a variable c is equal to my class so and so. Now,
10:59to call a method in a class you are using c dot method one or like you know c dot method two and
11:06you are giving and you are assigning a variable. So, this is how the general syntax of a class
11:12looks like. Now, inheritance. Inheritance is a feature used in object oriented programming. It
11:19refers to defining a new class with less or no modification to an existing class. Now,
11:25a new class is called derived class from one which it inherit ok and it is called as the base.
11:32So, inheritance is basically you have a mother and a child. So, the inheritance capability. So,
11:39the same thing here is applied in the case of programming. The one from which it inherits is
11:44called as base. Now, python supports inheritance. It also supports multiple inheritance. Now,
11:51a class can inherit attributes behavior methods from other class or another sub classes or a
11:58higher of classes. So, these are just a basic things which you already know but there are
12:02certain differences in the case of python language. So, this is how the syntax for
12:08inheritance looks like. Now, coming to the constructors. Now, constructor is a class of
12:14function that instantiates an object to a predefined value ok. Now, it begins with a
12:21double underscore. So, basically the function here is underscore init underscore then the method ok.
12:28So, this is how the example works like. So, this is the example of the syntax used here for the
12:36constructors. So, with this you will understand how the class object inheritance and constructors
12:44work for python. So, these all needs to be coded up so that you can understand them better. Just
12:51the theoretical side is just your basic knowledge of what you can use, how to use and when to use,
12:57but basically the programming side is where you get to know how exactly the language works.
13:03So, with this I conclude this session. Thank you so much.