Python readline() usage and examples

Python File (File) Methods

Overview

readline() This method is used to read an entire line from the file, including the "\n" character. If a non-negative number is specified, it returns the specified number of bytes, including the "\n" character.

Syntax

readline() method syntax is as follows:

fileObject.readline(size)

Parameter

• size -- The number of bytes read from the file.

Return value

Return the bytes read from the string.

Example

The following example demonstrates the use of the readline() method:

File w3The content of codebox.txt is as follows:

1:fr.oldtoolbag.com
2:fr.oldtoolbag.com
3:fr.oldtoolbag.com
4:fr.oldtoolbag.com
5:fr.oldtoolbag.com

Loop to read the content of the file:

# Open the file
fo = open("w3codebox.txt, \
print("The file name is: ",　fo.name)
line = fo.readline()
print("Read the first line　%s"　%　(line))
line = fo.readline(5)
print("The string read is:　%s"　%　(line))
# Close the file
fo.close()

The output result of the above example is:

The file name is:　　w3codebox.txt
Read the first line　1:fr.oldtoolbag.com
The string read is:　2:www

Python File (File) Methods