What does the prefix 0o indicate about a number in Python?

In Python, the prefix "0o" indicates that a number is written in octal notation. Octal is a base-8 numeral system that uses digits from 0 to 7. By using this prefix, Python interprets the number following "0o" as an octal number, which is particularly useful in certain computing contexts, such as when dealing with file permissions or interacting with low-level system processes that use octal values.

For example, if you write 0o10 in Python, it represents the decimal number 8 rather than the decimal number 10, because the digits are interpreted in base-8. The use of prefixes for different numeral systems helps keep the code clear and ensures that numbers are interpreted correctly according to their intended base.