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.
os.fchdir() method in Python is used to change the current working directory to the directory represented by the given file descriptor.
A file descriptor is small integer value that corresponds to a file or other input/output resource, such as a pipe or network socket. A File descriptor is an abstract indicator of a resource and act as handle to perform various lower level I/O operations like read, write, send etc.
For Example: Standard input is usually file descriptor with value 0, standard output is usually file descriptor with value 1 and standard error is usually file descriptor with value 2.
Further files opened by the current process will get the value 3, 4, 5 an so on.
os.fchdir() method is equivalent to os.chdir(file_descriptor) method.
Syntax: os.fchdir(fd)
Parameter:
fd: A file descriptor. The file descriptor must represent an opened directory not an open file.Return Type: This method does not return any value.
# Python program to explain os.fchdir() method # importing os module import os # Print the current working # directory using os.getcwd() method print("Current working directory:", os.getcwd()) # Path path = "/home/ihritik/Documents" # open the directory represented by # the above given path and get # the file descriptor associated # with it using os.open() method fd = os.open(path, os.O_RDONLY) # Change the current working # directory using os.fchdir() method os.fchdir(fd) print("Current working directory changed") # Print the current working # directory using os.getcwd() method print("Current working directory:", os.getcwd()) |
Current working directory: /home/ihritik Current working directory changed Current working directory: /home/ihritik/Documents
# Python program to explain os.fchdir() method # importing os module import os # Path path = "/home/ihritik/Documents/file.txt" # open the above path and get # the file descriptor associated # with it using os.open() method fd = os.open(path, os.O_RDONLY) # The file descriptor must # represent an open file # instead of an opened directory # The method will raise # 'NotADirectoryError' exception # Change the current working # directory using os.fchdir() method os.fchdir(fd) print("Current working directory changed") # Print the current working # directory using os.getcwd() method print("Current working directory:", os.getcwd()) |
Traceback (most recent call last):
File "changeDir.py", line 24, in
os.fchdir(fd)
NotADirectoryError: [Errno 20] Not a directory
# Python program to explain os.fchdir() method # importing os module import os # Path path = "/home/ihritik/Desktop/file.txt" # try opening the above path and get # the file descriptor associated # with it using os.open() method try : fd = os.open(path, os.O_RDONLY) # Try Changing the current working # directory using os.fchdir() method try : os.fchdir(fd) print("Current working directory changed") # Print the current working # directory using os.getcwd() method print("Current working directory:", os.getcwd()) # Catch exceptions # If file descriptor does # not represents a directory except NotADirectoryError: print("The given file descriptor does \ not represent a directory") # Catch exceptions # If path does not exists except FileNotFoundError: print("Path does not exists") # If there is any permission # related issue while opening # the given path except PermissionError: print("Permission denied") |
The given file descriptor does not represent a directory
