Python file fileno() usage and examples

Python File (File) methods

Overview

fileno() The method returns an integer file descriptor (file descriptor FD integer) that can be used for low-level operating system I/O operation.

Syntax

fileno() method syntax is as follows:

fileObject.fileno();

Parameter

• None

Return value

Return the file descriptor.

Example

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

# Open the file
fo = open("w3codebox.txt, "wb")
print("File name:　",　fo.name)
fid = fo.fileno()
print("File descriptor is:　",　fid)
# Close the file
fo.close()

The output result of the above example is:

File name:　　w3codebox.txt
File descriptor is:　　3

Python File (File) methods