0o542
0o542 is a numeric literal that uses the octal (base-8) system, denoting a number with the digits 5, 4, and 2 in base 8. The prefix 0o is used in several programming languages to indicate octal literals, most notably Python.
In decimal form, 0o542 equals 354. This is calculated as 5 × 8^2 + 4 × 8 + 2
Octal notation is structured so that each digit represents three binary bits, since 8 is 2^3. The
Beyond programming, octal literals sometimes appear in discussions of Unix file permissions and other contexts where