python random 源代码

以下是 Python 中 random 模块的源代码：

import _random
import math
import os
import sys
import time

class Random(_random.Random):
    VERSION = 3     # 版本号

    def seed(self, a=None, version=2):
        if version == 1 or version == 2 and isinstance(a, (str, bytes, bytearray)):
            a = hash(a)      # 将字符串类型的种子转换成整数类型的种子
            super().seed(a)
        elif version == 2 and isinstance(a, int):
            super().seed(a)
        elif version == 3 and isinstance(a, (str, bytes, bytearray)):
            if isinstance(a, str):
                a = a.encode()
            a += os.urandom(2500)
            super().seed(int.from_bytes(hashlib.sha512(a).digest(), 'big'))
        else:
            raise TypeError("a must be None, int, str or bytes")

    def getstate(self):
        return self.VERSION, super().getstate()

    def setstate(self, state):
        version = state[0]
        if version == 3:
            state = state[1]
        super().setstate(state)

    def jumpahead(self, n):
        if n >= 0:
            if n < 2**64:
                super().jumpahead(n)
            else:
                if not isinstance(n, int):
                    raise TypeError("n must be an integer")
                if n < 0:
                    raise ValueError("n must be non-negative")
                while n > 0:
                    if n & 1:
                        super().next()
                    n >>= 1
        else:
            raise ValueError("n must be non-negative")

    def __getstate__(self):
        return self.getstate()

    def __setstate__(self, state):
        self.setstate(state)

_inst = Random()
seed = _inst.seed
random = _inst.random
uniform = _inst.uniform
randrange = _inst.randrange
choice = _inst.choice
shuffle = _inst.shuffle
sample = _inst.sample
choices = _inst.choices

这是 random 模块的基础实现，用于生成伪随机数。你可以使用 `import random` 来使用该模块的功能。