#!/usr/bin/python
import time
from array import *
THINKING = 0
HUNGRY = 1
EATING = 2
class Philosopher:
def __init__(self):
self.ph = array('i',[1, 2, 3, 4, 5])
self.sleeptime = array('i',[30, 30, 30, 30, 30])
def initialization_code(self):
for i in range(self.ph.__len__()):
self.ph[i] = THINKING
def pickup(self,i):
self.ph[i] = HUNGRY
self.test(i)
if(EATING not in (self.ph[i])):
while(EATING not in (self.ph[i])):
time.sleep(self.sleeptime[i])
def putdown(self,i):
self.ph[i] = THINKING
self.test((i+4)%5)
self.test((i+1)%5)
def test(self,i):
if((2 not in (self.ph[(i+4)%5]))and(2 not in (self.ph[(i+1)%5]))and(self.ph[i]==HUNGRY)):
self.ph[i] = EATING
def start_process(self):
for i in range(self.ph.__len__()):
self.pickup(i)
self.putdown(i)
def display_status(self):
for i in range(self.ph.__len__()):
if (self.ph[i] == 0):
print "%d is THINKING" % i+1
elif (self.ph[i] == 1):
print "%d is WAITING" % i+1
elif (self.ph[i] == 2):
print "%d is EATING" % i+1
phil = Philosopher()
phil.initialization_code()
phil.start_process()
phil.display_status()
以上是我的代码片段,其中我试图在python中实现餐饮哲学家问题 . 当我运行此代码时,它显示我的错误:
Traceback (most recent call last):
File "dining.py", line 59, in <module>
phil.start_process()
File "dining.py", line 43, in start_process
self.pickup(i)
File "dining.py", line 27, in pickup
self.test(i)
File "dining.py", line 38, in test
if((2 not in (self.ph[(i+4)%5]))and(2 not in (self.ph[(i+1)%5]))and(self.ph[i]==HUNGRY)):
TypeError: argument of type 'int' is not iterable
任何人都可以帮助我,为什么它显示这个错误 . 我搜索了它但无法解决 . 提前致谢!!
3 回答
你的方程导致整数 . 你不能在整数上使用
in
.除了
in
的问题,它只能应用于迭代和类定义中具有__contains__
的对象,你可能会遇到下一个问题:你没有并行化 . 所以你应该使用线程或替换行 - 这是一个无限循环,因为没有人设置
EATING
状态 .或者你应该通过其他方式,通过不断检查挂钟时间或通过创建一个事件调度系统来完成计时,该系统负责必须完成的操作 .
BTW:
print "%d is THINKING" % i+1
也被打破了,因为i+1
周围没有()
,%
具有更高的优先权 .我认为你通常使用:
不正确 . 看起来你正在尝试比较应该完成的整数
而是运营商 .