Learn the first Python program

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In this article we will learn a simple Python program to get a little more insight into Python, before starting to learn about the main components of this programming language.

Usually, when starting to learn any programming language from Pascal, C to HTML, the first program that almost all teachers guide us to write is "Hello, World!" or "Hello!" This simple program will print the screen with a greeting.

As mentioned in previous articles, Python is an easy-to-learn programming language, and the creation of "Hello, World!" The simpler it is, you just need to write the code print("Hello, World!") .

Therefore, we will go to learn another program, also simple, for you to understand a little more about this programming language. Temporarily name it Add two numbers:

 # Them hai so va in tong 
 num1 = 6 
 num2 = 9 
 sum = num1+num2 
 print(sum) 

What will the above code do?

Line 1: # Them hai so va in tong

Any line of code in Python starting with # will be a comment, a comment. It is used to describe what the code below is for. This will help other programmers, code readers, understand code better. Lines that begin with # will be ignored by code compilers and code interpreters.

Line 2: num1 = 6

num1 here is the variable, you can store the value in the variable and in this case num1 stores the value 6.

Line 3: num2 = 9

Same as above, 9 is stored in num2 .

Line 4: sum = num1+num2

The sum of variables num1 and num2 is stored in another variable sum .

Line 5: print(sum)

The print() function print() the output on the screen. In this case it will print the result 15 on the screen, after you press F5.

A few notes:

To represent a statement in Python, we use the new line (Enter). The use of the sign; at the end of the statement is optional (not required as in C / C ++, JavaScripts or PHP). In fact, you should ignore the signs; This is at the end of the Python statement.

Instead of brackets {}, indents are used to represent a block of statements. For example:

this_is_MS_Office:

this_is_Word:

this-is-Word-document

this_is_Excel:

this-is-Excel-spreadsheet

Let's wait and see in the next lesson, we will know more about Python.

Next lesson: Introducing about strings, numbers, and lists in Python

 

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