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os.access(path, mode);

#!/usr/bin/python3

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)

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