How to detect whether a file is readable and writable in Python?

Before reading or writing a file, access should be checked first. How to detect whether a file is readable and writable in Python?

You can use the

os.access(path, mode)

library function https://docs.python.org/release/2.6.6/library/os.html#os.access like the Linux access library function for C.

It returns True if access is allowed, False if not.

For readable and writable, you can test file path with mode set to:

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.