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Hey guys, welcome back to this channel.
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In today's quick Python exercise, we are
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going to catch and fix a very common
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beginner mistake. One that has to do
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with string concatenation when
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calculating the average of numbers.
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Trust me, if you're new to Python, you
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have probably run into this without even
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realizing it. So, let me show you the
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So let's write a program
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So let's write. So number equal to input
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enter the first number
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this will be number one.
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Enter the second number.
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And now in order to calculate the
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we are going to take a variable called
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and just give number one plus number two
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So it's looks simple, right? But guess
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what? This code will throw an error. And
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can you please spot the issue?
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I want you to pause the video here and
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Okay, so here is what wrong. The input
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function in Python always returns a
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string. Even if you type in a number, so
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when the code tries to add number one
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plus number two plus number three, it's
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actually joining three strings and not
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doing any math. and it gets worse and
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then it tries to divide the string by
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three which Python doesn't allow and
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it'll lead us to a type error.
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So if you want we can do this right away
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and we can run this and we can check.
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So like for example 1 2 3 see you see a
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unsupported operand type is string and
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So how do we fix it? We simply need to
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convert those inputs into numbers using
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float or int depending on whether we
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want decimal support.
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So here is the fixed version. So I
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sometimes you know when it when you're
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dealing with averages you need inputs in
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float. So I'm converting the input from
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So here's a fixed version
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and notice that we are now using float
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in order to convert each input and that
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means if a user enters 10 20 and 30 we
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actually get numbers not strings and we
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can safely perform math on them.
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And let's run this code now. And enter.
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So enter the first number 10 20 30. So
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here I'm again concatenating
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and this is actually an integer or it
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could be a float number and I'm trying
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to concatenate it with the string and
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that's where we can do wrong. So you can
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either do something like you can do
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something like this you can convert the
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you know it to string and then you can
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try doing it and then it'll work this
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See uh or you can also do
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can remove this and you can just add
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and then you can do this.
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That's exactly what we wanted. And just
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like that, you have learned a really
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important debugging skill. And always,
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always check your data types, especially
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when dealing with user input. And if you
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like this video, make sure to like,
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subscribe, and share this with your
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fellow Python learners. And drop a
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comment if you have ever made this
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mistakes before. So see you in the next
