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Python 3 Program to Find the Largest Number in the Array or List of Numbers Tutorial For Beginners
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Jun 1, 2025
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uh hello guys welcome to this video so
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in this video I will show you a very
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simple program inside Python which is
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typically asked inside interviews and
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competitive programming how to get the
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largest number from a
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list array of list of numbers so if you
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have a bunch of numbers inside this list
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something like we have this inside the
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program 12 45 67 23 89 5 so quite a
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number of ways by which you can do this
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i will show the very simplest way using
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the for
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loop so now let me first of all execute
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this program and show the output how it
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executes so as soon as you execute this
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it will calculate all the numbers which
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are present right here and the output
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should be 67 as you can see it is the
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largest
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number so it will result the largest
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number in the list is 89 sorry the
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largest number is
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89 so it basically finds out the largest
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number and returns it so now let me show
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you how it
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does for this let me show you uh this
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software which is Python tutor which is
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a very famous tool for explaining
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programs so I will show you visualize it
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step by step so first of all we have the
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bunch of numbers right here in this
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array list of numbers so it registered
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right here so which zero index it is 12
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45 67 23 89 5 so now I'll be showing you
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the very easiest way by which we'll be
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using the for loop and we will go one by
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one to each
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number and uh do the calculation for
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this we will declare a variable which
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will be holding the maximum
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number this variable name can be
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anything i'm just calling it maximum
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number and I'm initializing it to the
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first number in the array which is 12 by
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default so we are assuming that first
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number is the largest number so we are
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storing it number zero so we are
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accessing the first element in the array
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which is 12 so as you can see maximum
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number is 12 so now we are simply having
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this for loop we are looping through
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this array so now inside this array
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sorry for loop we have this if condition
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that if the number is greater than the
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maximum number then we are simply
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initializing that number to the maximum
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number so we are updating it so now the
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first array first number is 12 so 12 is
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not greater than 12 so this condition
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will evaluate to false so this will not
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be executed so as you can see the number
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is 12 the maximum number is also 12 so
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this condition will not be executed we
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come to the next number which is 45 so
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in this case 45 is greater than 12 so
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now we will be replacing this 12 number
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with 45
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so this will
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do so now we will initialize this update
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this maximum number
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variable so as you can see now it has
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changed from 12 to 45 now we will come
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to the next number in the list which is
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67 so 67 is greater
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than 45 so this again
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will update and once again this number
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will be replaced now 67 will be replaced
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here as you can see now we'll be coming
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to the next number which is 23 so this
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condition will evaluates to false
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because 23 is not greater than 67 so we
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will move to the next
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number which is 89 so once again 89 is
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the largest number so 89 is greater than
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67 so this if condition will evaluates
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to true so 67 will be replaced by
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89 so you can just see how easy it is
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now you'll come to the next number which
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is five which is not the largest number
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you'll be moving to the next index so
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now this will the for loop will break
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out and then we'll simply print out the
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largest number of the list is
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89 so this is a very simplest approach
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guys using the for loop we require only
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one variable for this approach which is
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maximum number where you will store the
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maximum number while looping through the
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list we are processing each number in
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the list and simply comparing that if
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the number is greater than that if it is
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greater then we are replacing it and
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after that finding out each processing
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each element then we are returning the
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largest number in the list so very
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simple simple uh approach and it
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actually takes very few steps as well so
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thank you very much for watching this
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video and also check out my website
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freemediatools.com
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uh which contains thousands of tools