File Handling In Python

Introduction

 

In this article, I will explain about file handling in Python.

 

Definition

 

File handling has some functions for creating, reading, updating, and deleting files.

 

File handling

 

In Python, open () two parameters. One parameter is reporting name and any other parameter is mode. There are four forms of mode. There are:

1. “r” =read () is used for reading the file.
2. “a” =append () is used to append the file (append mode)
3. “w” =write () is used to write the file (write mode)
4. “r+” ==read () and write () mode are used in the file handling.
5. “t” - t is text mode
6. “b” - b is binary mode

Syntax

f=open(“filename.txt”)

(or)

f=open(“filename.txt”,“rt”)

Both are same because “r” is default mode and read mode, “t” is default mode and text mode

 

Open file and read mode

 

To open the file used keyword open (). The read () method for reading the file.

 

Example

f=open("F:/download surya/demo.txt","r") #file name and mode
print(f.read())# read mode

Output

 

Simple read mode program.

 

 

Read only part of the File

 

In Python, the read method returns the whole text. We can also specify how many letters you want to return.

 

Example

f=open("F:/download surya/demo.txt","r") #file name and mode
print(f.read(2)) # how many letters you want to return.

Output

 

Return the first 2 letters in the file.

 

 

Read lines

 

In python, we can return first (or) one line by using the readline () method keyword.

 

Example

f=open("F:/download surya/demo.txt","r")#read mode
print(f.readline())#Return first line in the output screen.

Output

 

Return one line in the output screen.

 

 

Loop in file

 

In Python, looping through the lines of the file, we can read the whole file, one by one.

 

Example

f=open("F:/download surya/demo.txt","r")#read mode
for x in f:# Return the file one by one.
  print(x)

Output

 

Return the file one by one.

 

 

Close files

 

In Python, we want to close the file when you complete the work using the close () method keyword.

 

Example

f=open("F:/download surya/demo.txt","r")#read mode
print(f.read())
f.close()# close() method is to close the file

Output

 

Close the file when you are finished with your work.

 

 

Conclusion

 

In this article, we have seen file handling in Python. I hope this article was useful to you. Thanks for reading.