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welcome to the automation zone in this tutorial we learn four different ways for you to parameterize your strings in Python the first way is by concatenation the second way is by the percentage placeholder the third way is by using the format placeholder and finally the last way is something which is newly released in Python which is your F strings why is parameterization required now in the above string if I wanted to change a name from Tom to Jack it is very easy just because I have a small string this becomes very complicated with the length of the string also if I wanted to print this line hundreds of times for hundreds of different names would it not be easy if I could pass a name has a variable rather than it being a static string so though let me print this out first and you will see Jack is a good programmer he is 25 years old he loves to eat apples in this case I can parameterize his name his age and the fruit which he likes to eat by using our first technique which is concatenation let me show you that code now in this code has you see I have assigned variables to save his name his age and the fruit which he likes to eat and these variables are then implanted inside of my string if I'm adding a variable before my string simply type in a variable add a plus sign and then give you a string the opposite the opposite is for if I am adding a variable after the end of my string which is after the string ends add a plus sign and then give a variable if you are giving a variable in between of your string make sure you are splitting your string into two parts and in between you're giving two plus signs and your variable goes in between make sure that if these are strings you are concatenating it with a string has well if you give numbers or some other format it might feel depending on your program so now in this case I can easily change his age to say 40 I can change the name to Jack and I can change the fruits to maybe apples and if I run it you will see in Jack is a good programmer he's 40 years old and he likes to eat apples so in this way I have parameterize my string by using concatenation the next technique is concatenation by using placeholders using percentage sign let me just delete this piece of choreo and let me have the same string all over again on me let me uncomment this now we are going to parameterize our string in the exact same locations however by using placeholders so to use placeholders just go ahead and type percentage s in the locations where you want your string to be parametrized so here I am passing in percentage s for my name for my age and for the fruit that he likes after this and after your string just type in a percentage sign and then your parentheses now in this string I have got 3 placeholders 1 2 & 3 therefore in my parentheses I have to pass in 3 arguments the first one second one and then the third one the first one will be assigned to the first placeholder therefore the name I am going to give in the name has Jack the age has 40 and the fruited he likes has apples now if I run this program you would see the exact same thing is passed to our string and that modified string is printed below now note that percentage S stands for a string placeholder therefore I can't pass strings to it a percentage D stands for numbers or decimal so if I am passing a string to a number placeholder that is going to throw you an error so make sure that you are passing correct parameters to the correct placeholders else you will meet up with an error let me run this now and has you see the core works the other thing to notice your parameters to your place holders can either be given to your string directly or it can also be given to the variable that contains your placeholders for example here I'm passing this particular string to the variable old story and I'm putting the parameters using the percentage sign to my variable which contains the string that would work just as well you see how the output remains the same the next technique is placeholders but this time by using the format method so let me just delete this piece of code right here and let me uncomment the exact same code has before the format method is preferred over the percentage method the technique will remain the same the places where you want to parameterize simply pass in these brackets which is your curly brackets instead so I'm gonna pass in these curly brackets for my name for the age and for the fruit that he likes to eat now after your string you can type a dot format method or I can pass in the exact same method after the variable that contains the string I'm going to use a variable just for simplicity now just as before the first bracket has got the index 0 index 1 and index 2 therefore inside my format method I have to pass in 3 arguments so these three arguments are going to be the name the age and the fruit daddy likes for example Dom his ages say 40 and he likes to eat apples and if I run the program you can see the output below being printed successfully the format method has certain advantages over the percentage method for example I am able to change the default indexes for example here I'm giving the index has to the index 1 and the index 0 so in this case apples here will be us apples here which is 0 1 2 index 2 will be assigned to this particular place holder and Tom which is index 0 will be - this placeholder right here let me run my core you will see the output is different Apple is a good programmer he is 40 years old he lurked he loves to eat Tom the other thing is I can give the same placeholder again I can repeat the placeholder for example let me just change the placeholders to what it was before which is zero one and two and now instead of giving he I can give the exact same place holder has your placeholder with the index zero and he will change back to with the placeholder with the index zero so in this case Python will only see three placeholders which is one with the index zero one with the index one and one with the index two hence I do not need your six parameters but just three parameters or three arguments now if I run this code you will see a tom is a good programmer Thomas 40 years old Tom loves to eat apples this is going to reduce my programming time as I need less arguments to perform the exact same code the last thing is this I have the ability to give meaningful names over my indexes for example this is going to be my name right some will give name I am ready place name for all of my indexes with the value 0 this is going to be my age so type in age and this is going to be the fruit right so fr uit and in my values I can now define it like this I can say name is equal to Tom I can state here that age is equal to 40 and I can give fruit is equal to apples in this way I do not need to rely on indexes I can rely on the names for my placeholders which will help you avoid making silly mistakes if I run this code now you will see that the output will be exactly the same the other thing to note is I am not limited to just using strings I can use numbers as well so that is not going to cause any problem for you the last technique which is currently used by many people is the F string in order to explain F string let me delete this piece of code and open up a new example now Yura have the exact same string here and I've got three variables now f string will allow you to embed Python code directly inside of your string and this is going to be useful to you in so many ways in order to do that this before your string you for type in an F by typing in an F right before your string you are basically stating that your string is an F string now in order to embed Python code simply type in the brackets as before now you can type in Python code right here now python code can be a thing for example it can be a variable so i'm going to type in the variable here called name hence when the code runs okay i type debug my mistake yeah so when the python code runs it is on go to print name but it is good treat name has a python code which is basically a variable which contains tom hence tom is printed out right here I can also insert thus typing in variables I can type in numbers or I can even have expressions for example 25 plus 5 if we're on this score we'd see her the age is printed has a sum you know it runs the code which is printed inside of your brackets has a Python code and then the output is converted into a string and displayed below let me do the same thing for apples as well Here I am going to pass in the variable itself now if I run it you can see tom is a good programmer he's 30 years old he loves to eat apples this is going to give you the ability to not only put variables inside but also to you know play around with the variables do specific mathematical tasks and not just your strings and your numbers but you can also pass in objects pasen functions you can basically pass it anything that you want inside of an F string and that will be converted into a string it will get concatenated and it will be displayed for you in the output so this is the basics of your four methods in which you can format your string the first one is concatenation the second one is I by using placeholders by using a percentage sign the second is by using the format method also placeholders and the last one is by using the F string that's it for this tutorial on strings if you have any questions whatsoever do comment below and I will help you out if you like the series on Python do show your support by liking and sharing this video and subscribing to my channel thank you all for watching