randint 方法 returns 每次执行时的值相同

Question

在下面的代码中，我试图学习如何使用同步线程。如下代码所示，我每 3 秒生成一个线程，并将一个随机数传递给方法 isNumPrime(...) 检查生成的数字是否为素数。我面临的问题是

1-我每次收到的输出我运行代码是相同的。请查看下面的输出。每次按 ctrl+f5 都会生成相同的随机数是

        thread_1 = threading.Thread(group = None, target = self.isNumPrime, 
        name='Thread_1', args = (), kwargs=dict(targetNum=randint(0,100)), 
        daemon = None)

确实生成了随机数`??因为我得到的不是随机生成的数字。我希望每次按下时都会收到不同的生成数字 ctrl+f5

2-给定输出 belwo，为什么我收到重复输出“in loop: targetNum: xx”？每次迭代都必须显示一次，其中的数字范围为 (3,targetNum)

代码:

import threading
import logging
import time
from random import seed
from random import randint

class ThreadsWithSync(threading.Thread):

    def __new__(cls):
    """
    For object creation
    """
    print("cls: %s"%(cls))
    #cls.onCreateObject()
    instance = super(ThreadsWithSync, cls).__new__(cls)
    #print("instace: %s"%(instance.__repr__)) #activate this line whenever an informative and descriprtive text about the instance is needed to be displayed
    return instance
    
    def __init__(self):
    """
    For object initialization
    """
    #print("self: %s"%(self)) 
    threading.Thread.__init__(self) #to initialize the super class
    print("self: %s"%(self))
    seed(1)

    @classmethod
    def onCreateObject(cls):
    """
    This will be invoked once the creation procedure of the object begins.
    """

    def __repr__(self):
    """
    similar to toString in Java
    """
    return "\n__class__: " + repr(self.__class__) +"\n__new__:" + repr(self.__new__) + "\n__str__: " + repr(self.__str__) + "\n__sizeof__: " + repr(self.__sizeof__)
    
    def isNumPrime(self, targetNum):
    
    if targetNum == 0 or targetNum == 1:
        print("targetNum passed to method, will return false: %s"%(targetNum))
        return False

    if targetNum == 2:
        print("targetNum passed to method will return true: %s"%(targetNum))
        return True

    isPrim = True
    for i in range(3,targetNum):
        print("in loop: targetNum: %s"%(targetNum)) 
        if targetNum % i == 0:
            isPrim = False
            break
    print("is %s a prime : %s"%(targetNum, isPrim)) 
    return isPrim

    def spawnThread(self):
    if __name__ == "__main__":
        self.main()

    def main(self):
    while True:
        thread_1 = threading.Thread(group = None, target = self.isNumPrime, name='Thread_1', args = (), kwargs=dict(targetNum=randint(0,100)), daemon = None)
        #thread_2 = threading.Thread(group = None, target = self.isNumPrime, name='Thread_2', args = (), kwargs=dict(targetNum=randint(0,100)), daemon = None)
        thread_1.start()
        #thread_2.start()
        time.sleep(3)

t1 = ThreadsWithSync()
t1.spawnThread()

输出:

in loop: targetNum: 17
in loop: targetNum: 17
in loop: targetNum: 17
in loop: targetNum: 17
in loop: targetNum: 17
in loop: targetNum: 17
in loop: targetNum: 17
in loop: targetNum: 17
in loop: targetNum: 17
in loop: targetNum: 17
in loop: targetNum: 17
in loop: targetNum: 17
in loop: targetNum: 17
in loop: targetNum: 17
is 17 a prime : True
in loop: targetNum: 72
is 72 a prime : False
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
is 97 a prime : True
in loop: targetNum: 8
in loop: targetNum: 8
is 8 a prime : False
in loop: targetNum: 32
in loop: targetNum: 32
is 32 a prime : False
in loop: targetNum: 15
is 15 a prime : False
in loop: targetNum: 63
is 63 a prime : False
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
...
...
... 
...
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
in loop: targetNum: 97
is 97 a prime : True
in loop: targetNum: 57

Answer 1

由于您以相同的方式初始化种子，所以每次都会得到相同的数字。完全不要调用 seed(1)。

至于每次打印 targetNum - 也许你不应该在循环中打印它。

Answer 2

正如其他人所说，从您的 seed() 调用中删除 1。将其留空 seed().

至于为什么会重复targetNum，是因为你让它打印targetNum。 :) 尝试打印 i 代替：

print("in loop: targetNum: %s"%(i))

randint 方法 returns 每次执行时的值相同

randint method returns the same value on each execution

python

python-3.x

random

python-multithreading

seed