Which prefix denotes a binary number in Python?

In Python, the prefix that denotes a binary number is represented by "0b". This prefix indicates to the Python interpreter that the digits following it are in base 2, which is the binary numeral system. For example, the binary number "0b1010" corresponds to the decimal value 10.

Using "0b" helps ensure that the interpreter properly understands the number's base; without this prefix, Python treats the number as decimal by default. This is crucial for correct data representation and manipulation within your programs, especially when you're working with low-level operations, bitwise calculations, or representing binary data.

In contrast, other prefixes serve different numerical bases: "0x" indicates a hexadecimal (base 16), "0o" refers to an octal (base 8), and "0d" is not a standard prefix in Python as there is no specific designation needed for decimal numbers. Therefore, "0b" is the specific representation for binary numbers in Python.