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How to use Python to write a program, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain for you in detail, people with this need can come to learn, I hope you can gain something.

Nowadays, the market trend of IT programming education is gradually developing to pan-Internet people, especially more and more people are learning Python. This article is about how to start writing the first program in Python to start your learning journey. First of all, before you officially start your own programming, you should install the text editor, and then master the operation of the command line terminal. When everything is ready, we can start writing the first program.

1. Enter the content

First enter the following in the text editor:

Print "Hello World!"

Print "Hello Again"

Print "I like typing this."

Print "This is fun."

Print 'Yay! Printing.'

Print "I'd much rather you 'not'."

Print'i "said" do not touch this.'

2. File naming

After writing the first program in Python, we need to write the following to a file named ex1.py. Note the naming. It is best to end the Python file with .py.

In the process of entering the program, there are two points to pay attention to. First, there is no need to enter the leftmost line number, their function is that when I discuss a line of code with you, I can say to you, "Please look at which line". You don't need to type the line number into the Python script. Second, print is used at the beginning of every line of ex1.py, and they look exactly the same. Each character has its own role in the script, the color is not important, the important thing is that what you enter is correct.

3. Analyze the error situation

Then run this code at the command line terminal by typing the following: python ex1.py

Before the python ex1.py command, you may see different computer or directory names, which is not a problem, but what you will see when you enter the command. If you encounter an error similar to the following:

$python ex/ex1.py

File "ex/ex1.py", line 3

Print "I like typing this.

^

SyntaxError: EOL while scanning string literal

Let's take a look at the meaning of these messages that prompt you to make mistakes in programming. It is important to be able to read these error messages, because you may make more mistakes later. But we need to know what went wrong before we can correct it.

First, we type the command at the command line terminal to run the ex1.py script. Python tells us that there is an error on line 3 of the ex1.py file, and Python prints out a ^ (pound sign) symbol to indicate the location of the error. Notice that a "(double quotation mark) symbol is missing? then the contents of this line are printed. Finally, it prints out a "SyntaxError" that tells you what kind of error it is. Usually these error messages are difficult to understand, but you can copy the error message to the search engine, and then you can see that others have encountered such errors, and maybe you can find out how to solve the problem on the Internet.

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