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Hey everyone, welcome back to our Python
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journey. So this is module 3 and today
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we are stepping into one of the most
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powerful concepts in programming which
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is making decisions using conditions.
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So in this video we'll be exploring if
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else decision structures. So in other
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episodes we'll be going with the if l if
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else decision structure and even python
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nested if statements and then we will go
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through the exercises.
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Don't worry we are going to do it step
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by step. So this video so in this
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episode it will be all about if and else
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let's start with if else decision
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structure. So think of it like this like
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you are giving your program a condition
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to check based on whether that condition
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is true or false. Like the program
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decides which block of code to run. Like
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I could say if it is raining
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let's just think that if it is raining
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then you'll carry an umbrella else you
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won't. It's just simple.
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So here is how it looks in Python.
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if this is true, if this condition if it
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is raining then you will carry the
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umbrella. If not which is nothing but
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you won't or maybe you'll just walk
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without umbrella something like that. So
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let me show you one more basic example.
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If you see here like for example x value
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is 7 and if x is less than 10. So if 7
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is less than 10 then it is true. So then
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it will just print whatever the code
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that you write here. Else it will print
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whatever like if it is if this condition
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is false then it will print this. I hope
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you are getting my point. So if
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So now python will be thinking that what
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is this x and what is its value? So
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let's just give value of x = 7. Okay.
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And if x = 7 then just print
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Okay. So if x if x is less than 10 is
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nothing but 7 is less than 10 then print
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7 is less than 10. x is less than 10.
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else exist 10 or more then it could be
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equal to 10 or maybe greater than 10.
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So here is how Python checks. I'm
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repeating again is x less than 10 if yes
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if it's true goes this line if not runs
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this one. You can check.
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See X is less than 10. And what if you
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X is 10 or more. Just give 10.
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X is 10 or more. See that's the
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So this is the condition and this is the
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code to execute and this is if keyword
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and else keyword. So if is not met then
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it will go to else. So this is what
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and don't worry if and else must be
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aligned properly with columns.
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This is important. And also they must
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follow the indentation because Python is
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super picky about indentation. It
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doesn't like if you don't give
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indentation. You can just check like if
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I do it immediately it will throw error
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on my face. I didn't even execute it.
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But if you see see there is something it
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is expecting which is nothing but just a
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Okay let's do more relatable one.
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Like for example, age equal to 18.
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age greater than or equal to 18,
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you are of legal age.
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So what's happening here? We have a
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variable called age and its value is 80.
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Then the if statement checks is age
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greater than or equal to 18.
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If yes, if it's true, then it will print
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you are of legal age. Else you are
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It's like this. You are standing at the
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entrance of a movie theater and a guard
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checks your ID. Okay? And if your age is
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18 or more, then they will say come in.
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Otherwise, sorry, you are too young. So
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that is what maybe you are designing a
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portal where you want to check the age
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of a person whether the person have a
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legal age or not. You know that there
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are some rules that in most of the
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like it could be Facebook or any other
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social media accounts it will check the
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age whether the person is above 18 or
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not. So in the same way in order to
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check that we need this if else
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statements. So that is how if else works
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in Python. It's the most basic decision
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making structure but you will see it all
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Okay. So the syntax is just like this.
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If if condition is true
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It's just as simple as that.
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So this is what we are doing it. In the
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next part we'll go one step further.
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We'll cover if else where you have
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multiple choices and it's like a menu
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like if not pizza then maybe pasta or
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else go with any salad. So stick around
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and let's keep building step by step
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together. If you still have any doubts
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regarding the if else structure, syntax,
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why we are doing this, why we are doing
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that. If you have any other doubts, just
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comment down below. We'll try to make
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more simpler version of this video. If
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you learned something from this video,
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then subscribe to this channel and hit
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that like button so that even other
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people who are learning Python can help
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this video to them as well. See you in
