Python | os.access() Method - GeeksforGeeks

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 existencemode: 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 librariesimport osimport 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_OKpath1 = os.access("gfg.txt", os.F_OK)print("Exists the path:", path1)  # Checking access with os.R_OKpath2 = os.access("gfg.txt", os.R_OK)print("Access to read the file:", path2)  # Checking access with os.W_OKpath3 = os.access("gfg.txt", os.W_OK)print("Access to write the file:", path3)  # Checking access with os.X_OKpath4 = 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 pathif 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 issueMy Personal Notes
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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 librariesimport osimport 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_OKpath1 = os.access("gfg.txt", os.F_OK)print("Exists the path:", path1)  # Checking access with os.R_OKpath2 = os.access("gfg.txt", os.R_OK)print("Access to read the file:", path2)  # Checking access with os.W_OKpath3 = os.access("gfg.txt", os.W_OK)print("Access to write the file:", path3)  # Checking access with os.X_OKpath4 = 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 pathif 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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python-os-module
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