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Python os.access() Method


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Description:

This method uses the real uid/gid to test for access to path. Note that most operations will use 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.

This method returns True if access is allowed, False if not.

Syntax:

os.access(path, mode);

Parameters:

Here is the detail of parameters:

  • path: This is the path which would be tested for existence or any access.

  • mode: This should be F_OK to test the existence of path, or it can be the inclusive OR of one or more of R_OK, W_OK, and X_OK to test permissions.

    • os.F_OK: Value to pass as the mode parameter of access() to test the existence of path.
    • os.R_OK: Value to include in the mode parameter of access() to test the readability of path.
    • os.W_OK Value to include in the mode parameter of access() to test the writability of path.
    • os.X_OK Value to include in the mode parameter of access() to determine if path can be executed.

Example:

#!/usr/bin/python

import os, sys

# Assuming /tmp/foo.txt exists and has read/write permissions.

ret = os.access("/tmp/foo.txt", os.F_OK)
print "F_OK - return value %s"% ret

ret = os.access("/tmp/foo.txt", os.R_OK)
print "R_OK - return value %s"% ret

ret = os.access("/tmp/foo.txt", os.W_OK)
print "W_OK - return value %s"% ret

ret = os.access("/tmp/foo.txt", os.X_OK)
print "X_OK - return value %s"% ret

This produces following result:

F_OK - return value True
R_OK - return value True
W_OK - return value True
X_OK - return value False


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