Python | os.supports_dir_fd object

OS module in Python provides functions for interacting with the operating system. OS comes under Python’s standard utility modules. This module provides a portable way of using operating system dependent functionality.

Some method in Os module takes a dir_fd parameter. As different platforms provide different functionality, dir_fd parameter might be available on one platform but unavailable on another. os.supports_dir_fd method in Python is a set object which indicates which methods in the OS module permit the use of their dir_fd parameter.

To check whether a particular method permits the use of its dir_fd parameter or not, can be checked using in operator on os.supports_dir_fd .
For example:
Below expression checks whether the dir_fd parameter of os.stat() method is locally available or not

os.stat in os.supports_dir_fd

Syntax: os.supports_dir_fd

Parameter: This is a non callable set object. Hence, no parameter is required.

Return Type: This method returns a set object which represents the methods in the OS module, which permits the use of their dir_fd parameter.

Code #1: Use of os.supports_dir_fd object to get the list of methods which permits the use of their dir_fd parameter

# Python program to explain os.supports_dir_fd object

# importing os module
import os


# Get the list of all methods
# who permits the use of
# their dir_fd parameter
methodList = os.supports_dir_fd

# Print the list
print(methodList)

Output:

{<built-in function symlink>, <built-in function stat>, <built-in function chown>,
<built-in function link>, <built-in function readlink>, <built-in function access>,
<built-in function rename>, <built-in function chmod>, <built-in function utime>,
<built-in function mknod>, <built-in function unlink>, <built-in function mkdir>,
<built-in function mkfifo>, <built-in function rmdir>, <built-in function open>}

Code #2: Use of os.supports_dir_fd object to check if a particular method permits the use of its dir_fd parameter or not

# Python program to explain os.supports_dir_fd object

# importing os module
import os



# Check whether os.stat() method
# permits the use of its dir_fd
# parameter or not
support = os.stat in os.supports_dir_fd

# Print result
print(support)


# Check whether os.lstat() method
# permits the use of its dir_fd
# parameter or not
support = os.lstat in os.supports_dir_fd

# Print result
print(support)

Output:

True
False