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。

Python进制转换(二进制、十进制和十六进制)实例

以下代码用于实现十进制转二进制、八进制、十六进制：

执行以上代码输出结果为：

python3 test.py

输入数字：5

十进制数为：5

转换为二进制为： 0b101

转换为八进制为： 0o5

转换为十六进制为： 0x5

python3 test.py

输入数字：12

十进制数为：12

转换为二进制为： 0b1100

转换为八进制为： 0o14

转换为十六进制为： 0xc

具体实现

十进制到二进制：

十进制到八进制：

十进制到十六进制：

python进2、8、16制转换源码

python 十进制整数转换为任意进制(36以内)

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