Python file readlines() usage and example

Python File (File) Method

Overview

readlines() The method is used to read all lines (until the end-of-file (EOF) character) and return a list, which can be processed by Python's for... in ... structure.

If it encounters the end-of-file (EOF) character, it returns an empty string.

Syntax

readlines() method syntax is as follows:

fileObject.readlines(　);

Parameter

• None.

Return value

Returns a list containing all lines.

Example

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

File w3The content of codebox.txt is as follows:

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

Loop to read the content of the file:

# Open file
fo = open("w3codebox.txt, "r")
print("The file name is: ", fo.name)
　
for line in fo.readlines():　　　　　　　　　　　　　　　　　　　　　　　　　# Read each line sequentially　　
　　　　line = line.strip()　　　　　　　　　　　　　　　　　　　　　　　　　　　　　# Remove leading and trailing whitespaces　　
　　　　print("The data read is:　%s"　%　(line))
　
# Close the file
fo.close()

The file name is:　　w3codebox.txt
The data read is:　1:pt.oldtoolbag.com
The data read is:　2:pt.oldtoolbag.com
The data read is:　3:pt.oldtoolbag.com
The data read is:　4:pt.oldtoolbag.com
The data read is:　5:pt.oldtoolbag.com

Python File (File) Method