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Python 3 Program to Add Two Numbers Using Command Line Arguments in Terminal Tutorial For Beginners
Jun 1, 2025
Get the full source code of application here:
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0:00
uh hello guys welcome to this video so
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in this video I will show you how to add
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uh two numbers uh using command line
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arguments inside Python we can directly
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pass the numbers in the command line
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instead of hard coding it inside the
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Python program so for this we use system
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module which is a built-in module inside
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Python so if you want to pass some
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command line arguments you use this
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package and uh now to receive these
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arguments use
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this property here which is system
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argv and by default the first argument
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is your actual Python script so we can't
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write zero here so this will be the
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second argument which will be the first
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number of the addition which will be
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passed similarly we will be receiving
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the second number
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so again we'll be using
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argb and two so this will be the first
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number second number and then we can
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simply print out the
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result like this so x +
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y so this is a very simple program now
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we simply are passing these two
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arguments
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so if I try to run this script
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here without passing anything if I
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directly write python app py you will
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see it will give me this error that you
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haven't passed this argument so what we
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need to do we need to pass two numbers
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here 10 20 so now if you see it is
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saying it is not essentially
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uh add adding these two numbers it is
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just concatenating it so 10 20 so this
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we don't want we need to increment this
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for doing this we need to first of all
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change this to an integer we need to
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type cast
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it so in this way by default everything
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is a string so we need to change this to
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a number by type casting it so this now
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has become integer so if you do this now
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you'll
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see this is again a string here so we
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need to again type cast this number to a
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string so we can do this now you will
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see the sum is equal to 30
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so type casting is very important
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feature whenever you want to convert
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your string to integer we use this
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function which is int and then whenever
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we want to convert your integer to
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string we use this function string we
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also have this as well float this is for
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use for floating
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numbers so this is a program which
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actually you can pass dynamic command
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line arguments
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so so 15 + 20 comes out to be 35 so you
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can do this for addition multiplication
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division anything the logic will remain
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the same you use this system module then
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we receive these arguments by this
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properties and
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this and in this way you can do this
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thank you very much for watching this
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video and uh also check out my website
3:30
freemediatools.com
3:32
uh which contains thousands of tools
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