Reading and writing text files in the python advanced tutorial,

Reading and writing text files in the python advanced tutorial,

Python has the basic function of reading and writing text files. The Python Standard Library provides richer read/write functions.

The read and write operations on text files are mainly implemented by file objects built by open.

Create a file object

Open a file and use an object to represent the file:
Copy codeThe Code is as follows:
F = open (file name, Mode)

 
The most common modes are:
Copy codeThe Code is as follows:
"R" # Read-Only
"W" # Write

For example
Copy codeThe Code is as follows:
>>> F = open ("test.txt", "r ")

File object Method

Read:
Copy codeThe Code is as follows:
Content = f. read (N) # read data of N bytes

Content = f. readline () # Read a row

Content = f. readlines () # Read all rows and store them in the list. Each element is a row.

Write:
Copy codeThe Code is as follows:
F. write ('I like apple') # write' I like apple' to a file

 
Close the file:
Copy codeThe Code is as follows:
F. close ()

Exercise

Create a record.txt file. The written content is as follows:

Tom, 12, 86
Lee, 15, 99
Lucy, 11, 58
Joseph, 19, 56
Then read and print the file from record.txt.

Summary

Copy codeThe Code is as follows:
F = open (name, "r ")
Line = f. readline ()
F. write ('abc ')
F. close ()