Name: 絶対初心者のためのPython入門（2020年版 (Introduction to Python for Absolute Beginners (2020))
Uploaded: 2021-01-14T08:56:38.000Z
Duration: 30 min 51 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

Warm up your fingers; in this lesson, we will start coding!

One of the main concepts in programming is variables.

Let’s say you want to have a variable x that is equal to the value of 5 and then ask

the computer to tell you the value of that variable.

So, we must tell the machine that x equals 5.

And this is how you could do this in Python.

To go through the process of programming, the line that says x equals 5 is called a

To make something out of it, we must execute it.

Only then will the computer carry out operations with it.

Press Shift and Enter (not just Enter), and a variable called x will be created and assigned

To be more precise, “equality” in Python and in programming means “assign” or “bind

Ok, we carried this operation, but we see nothing right now.

How can we ask the computer to show us the output of what we just did?

It would be sufficient to write x and then press Shift and Enter.

As you can see, typing in a single line of code entails a few concepts of programming

Now, let’s assign the value 8 to a variable we call y. … Alright, Shift plus Enter…

This shows us that Python is case sensitive, so pay attention to that.

It matters if you use lowercase or uppercase letters.

An alternative way to execute the instruction that will provide the value we assigned to

At first sight, it seems redundant as we showed we can just type “y”.

Nevertheless, this command is applied often; you’ll see it in most of the code produced

It complements the logical flow of your instructions.

For instance, if we say “print y”, the machine will simply execute this command and

provide the value of y as a statement, and this is all a programmer must see sometimes.

Its functionality is practically identical to the one just described for Python 2 with

the sole difference that here you must place the name of the variable within parentheses,

Then, you can press “Shift and Enter” to execute the code in the cell and see that

you’ll obtain an identical output – the number 8.

The difference stems from the fact that Python 3 treats “Print” as a function, while

Therefore, from now on, if you are using Python 3, and you see “Print” followed by a name

of a variable, please just add parentheses around the variable name and you’ll be good

We hope you found this comparison useful.

Now let’s continue by talking about Python variables.

The last thing I’d like to share with you in this lecture is you can assign a certain

number of values to the same number of variables.

To create the variables x and y, we have to assign two values – say, 1 and 2.

We must separate each of the variables and each of the values with a comma.

The parentheses here are not obligatory, but we use them to improve the readability of

Now, if I call x or y separately, the computer will correctly give me their respective values.

It is very important that the number of variables on that line equals the number of values;

otherwise, you will get an error message.

This is a great start to our journey in Python!

When programming, not only in Python, if you say that a variable has a numeric value, you

The reason is that numbers can be integers or floating points, also called floats, for

Integers are positive or negative whole numbers without a decimal point.

Let’s create x 1 and bind to it the value of 5.

A specific function in Python can prove this is correct.

Within the brackets, we must place the name of the variable whose type of value we want

Shift plus Enter and the result we obtained is “int”, which indicates the value is

The “type” function can also be applied directly to a value instead of a variable.

For instance, if I write “type, open parentheses, minus 6, close parentheses”, Python will

correctly point out that minus six is an integer.

Now, let’s assign the value of 4.75 to a new variable, x 2.

I would like to check its type; hence, I will use the type function again.

Floating points, or as you’ll more frequently hear, floats, are real numbers.

4.75 is such a number; therefore, Python reads it as a float.

Let’s look at two other built-in functions.

“Int” transforms the variable into an integer.

“Float”, instead, will add a decimal point to the integer value and will turn it into

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絶対初心者のためのPython入門（2020年版 (Introduction to Python for Absolute Beginners (2020))

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