Txt plain text operation

TXT Plain text operation

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Preface

Save data to TXT The operation of text is very simple , and TXT Text is compatible with almost any platform , But there is a drawback , That is not conducive to retrieval .

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One 、 operation TXT Ideas of the text

utilize Python Provided open Method to open a text file , Get a file operation object , Here it is assigned as file, Each part of the information extracted , using file Object's write Method writes the extracted content to the file .
After all extraction , Last call close Method to turn it off , The content can be successfully written into the text .

In fact, that is open、write、close The usage of these three methods .

open The first parameter of the method is the name of the target file to be saved ;
The second parameter is w, Represents writing text by overwriting ;
in addition , We also specified the file code as utf-8.
Last , After writing , You also need to call close Method to close the file object .

Two 、 Open mode ----open

open The second parameter of the method is set to w, This will empty the source file every time text is written , Then write the new content to the file , This is a file opening method . About how to open the file , In fact, there are several other , Here is a brief introduction .

Parameters	effect
r	Open the file read-only , It means that you can only read the contents of the file , Cannot write file contents . This is the default mode .
rb	Open a file in binary read-only mode , Usually used to open binary files , Like audio 、 picture 、 Video and so on .
r+	Open a file read-write , You can read and write files .
rb+	Open a file in binary read-write mode , You can also read and write , But what is read and written is binary data .
w	Open a file by writing . If the file already exists , Then cover it . If the file does not exist , Create a new file .
wb	Open a file by binary writing . If the file already exists , Then cover it . If the file does not exist , Create a new file .
w+	Open a file read-write . If the file already exists , Then cover it . If the file does not exist , Create a new file .
wb+	Open a file in binary read-write format . If the file already exists , Then cover it . If the file does not exist , Create a new file .
a	Open a file in append mode . If the file already exists , The file pointer will be placed at the end of the file . in other words , The new content will be written after the existing content . If the file does not exist , Create a new file to write .
ab	Open a file by binary append . If the file already exists , Then the file pointer will be placed at the end of the file . in other words , The new content will be written after the existing content . If the file does not exist , Create a new file to write .
a+	Open a file read-write . If the file already exists , The file pointer will be placed at the end of the file . Append mode when the file opens . If the file does not exist , Create a new file to read and write .
ab+	Open a file by binary append . If the file already exists , Then the file pointer will be placed at the end of the file . If the file does not exist , Create a new file for reading and writing .

2. Code

In the use of with as grammar . stay with At the end of the control block , The file will close automatically , So there is no need to call close The method .

with open('game_data.txt', 'a',encoding='utf-8') as txtfile:
    txtfile.write(f' Content to write text ')

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summary

This article only briefly introduces open Use