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Python | os.access() Method
  • Last Updated : 12 Sep, 2018

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.access() method uses the real uid/gid to test for access to path. Most operations uses the effective uid/gid, therefore, this routine can be used in a suid/sgid environment to test if the invoking user has the specified access to path.

Syntax:

os.access(path, mode)

Parameters:

path: path to be tested for access or existence
mode: Should be F_OK to test the existence of path, or can be the inclusive OR of one or more of R_OK, W_OK, and X_OK to test permissions.



Following values can be passed as the mode parameter of access() to test the following:

  • os.F_OK: Tests existence of the path.
  • os.R_OK: Tests readability of the path.
  • os.W_OK: Tests writability of the path.
  • os.X_OK: Checks if path can be executed.

     

    Returns: True if access is allowed, else returns False.

    Code #1: Understand access() method




    # Python program tyring to access
    # file with different mode parameter
      
    # importing all necessary libraries
    import os
    import sys
      
    # Different mode parameters will 
    # return True if access is allowed,
    # else returns False.
      
    # Assuming only read operation is allowed on file
    # Checking access with os.F_OK
    path1 = os.access("gfg.txt", os.F_OK)
    print("Exists the path:", path1)
      
    # Checking access with os.R_OK
    path2 = os.access("gfg.txt", os.R_OK)
    print("Access to read the file:", path2)
      
    # Checking access with os.W_OK
    path3 = os.access("gfg.txt", os.W_OK)
    print("Access to write the file:", path3)
      
    # Checking access with os.X_OK
    path4 = os.access("gfg.txt", os.X_OK)
    print("Check if path can be executed:", path4)

    Output:

    Exists the path: True
    Access to read the file: True
    Access to write the file: False
    Check if path can be executed: False

     
    Code #2: Code to open a file after validating access is allowed




    # Python program to open a file
    # after validating the access
      
    # checking readability of the path
    if os.access("gfg.txt", os.R_OK):
          
        # open txt file as file
        with open("gfg.txt") as file:
            return file.read()
              
    # in case can't access the file        
    return "Facing some issue"

    Output:

    Facing some issue

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