Python 内置函数进制转换的用法（十进制转二进制、八进制、十六进制）

使用Python内置函数：bin()、oct()、int()、hex()可实现进制转换。

先看Python官方文档中对这几个内置函数的描述：

bin(x)
Convert an integer number to a binary
string. The result is a valid Python expression. If x is not a Python
int object, it has to define an __index__() method that returns an
integer.

oct(x)
Convert an integer number to an octal
string. The result is a valid Python expression. If x is not a Python
int object, it has to define an __index__() method that returns an
integer.

int([number | string[, base]])
Convert a number
or string to an integer. If no arguments are given, return 0. If a
number is given, return number.__int__(). Conversion of floating point
numbers to integers truncates towards zero. A string must be a
base-radix integer literal optionally preceded by ‘+’ or ‘-‘ (with no
space in between) and optionally surrounded by whitespace. A base-n
literal consists of the digits 0 to n-1, with ‘a’ to ‘z’ (or ‘A’ to ‘Z’)
having values 10 to 35. The default base is 10. The allowed values are 0
and 2-36. Base-2, -8, and -16 literals can be optionally prefixed with
0b/0B, 0o/0O, or 0x/0X, as with integer literals in code. Base 0 means
to interpret exactly as a code literal, so that the actual base is 2, 8,
10, or 16, and so that int('010', 0) is not legal, while int('010') is,
as well as int('010', 8).

hex(x)
Convert an integer number to a hexadecimal
string. The result is a valid Python expression. If x is not a Python
int object, it has to define an __index__() method that returns an
integer.

	2进制	8进制	10进制	16进制
2进制	-	bin(int(x, 8))	bin(int(x, 10))	bin(int(x, 16))
8进制	oct(int(x, 2))	-	oct(int(x, 10))	oct(int(x, 16))
10进制	int(x, 2)	int(x, 8)	-	int(x, 16)
16进制	hex(int(x, 2))	hex(int(x, 8))	hex(int(x, 10))	-

bin()、oct()、hex()的返回值均为字符串，且分别带有0b、0o、0x前缀。