all Python 3Input & outputterm

Numeric literals

literals

Python can write numbers in binary (0b), octal (0o) and hexadecimal (0x), allows the _ separator for readability, and supports exponential notation.

Syntax

0b<биты>  0o<цифры>  0x<цифры>  <цифры>_<цифры>  <число>e<порядок>

All these forms produce a plain int — there is no separate "binary number" type, and it always prints in decimal; to get the prefixed form back use bin(), oct() or hex(), which return strings. Exponential notation is the exception: 1e3 is the float 1000.0, not an int. A leading zero in a decimal literal is a SyntaxError (010); octal needs the explicit 0o prefix.

Examples

print(0b1010)      # → 10
print(0o17)        # → 15
print(0xFF)        # → 255
print(1_000_000)   # → 1000000
print(1.5e3)       # → 1500.0
print(0b1111 == 15 == 0xF)  # → True

See also

Open in the full glossarydocs.python.orgReport an inaccuracy