4 – Parsing integers from different bases#
The built-in int can be used to parse integers from binary, octal, hexadecimal, and many other bases.
To do this, you need to specify the base you want as the second argument of int.
The valid bases are 2 through 36. (You use 2 for binary, 8 for octal, and 16 for hexadecimal.)
print(int("13")) # 13
print(int("101", 2)) # 5
print(int("ff", 16)) # 255
The second argument can also be the special value 0, which tells int to “guess” the base by parsing the integer as it if were an integer literal.
(It “guesses” the base if you use the base prefix: 0b for binary, 0o for octal, 0x for hexadecimal, and no prefix for decimal.)
print(int("0b101", 0)) # 5
print(int("0xff", 0)) # 255
Further reading: