随机算法python_梅森算法生成随机数的Python实现

import time

class Util(object):

def __init__(self):

self.index = 624

self.MT = [0] * 624

def inter(self,t):

return (0xFFFFFFFF & t) # 取最后32位->t

def twister(self):

for i in range(self.index):

y = self.inter((self.MT[i] & 0x80000000) + (self.MT[(i + 1) % self.index] & 0x7fffffff))

self.MT[i] = self.MT[(i + 397) % self.index] ^ y >> 1

if y % 2 != 0:

self.MT[i] = self.MT[i] ^ 0x9908b0df

self.index = 0

def exnum(self):

if self.index >= 624:

self.twister()

y = self.MT[self.index]

y = y ^ y >> 11

y = y ^ y << 7 & 2636928640

y = y ^ y << 15 & 4022730752

y = y ^ y >> 18

self.index = self.index + 1

return self.inter(y)

def mainset(self,seed):

self.MT[0] = seed # seed

for i in range(1, self.index):

self.MT[i] = self.inter(1812433253 * (self.MT[i - 1] ^ self.MT[i - 1] >> 30) + i)

return self.exnum()

def randomint(self,min_num,max_num):

try:

so = float(self.mainset(int(time.time()))) / (2 ** 32 - 1)

rd = min_num + int((max_num - min_num) * so)

return rd

except Exception as ex:

print "randomint function excute exception:" + str(ex)

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