在Python中调用多处理时,TypeError:'tuple'对象不可调用

2022-04-10 00:00:00 python python-multiprocessing

问题描述

我正在尝试使用多进程和队列执行以下脚本

from googlefinance import getQuotes
from yahoo_finance import Share
import multiprocessing


class Stock:

    def __init__(self,symbol,q):
        self.symbol = symbol
        self.q = q

    def current_value(self):
        current_price =self.q.put(float(getQuotes(self.symbol)[0]['LastTradeWithCurrency']))
        return current_price

    def fundems(self):

        marketcap = self.q.put(Share(self.symbol).get_market_cap())
        bookvalue = self.q.put(Share(self.symbol).get_book_value())
        dividend = self.q.put(Share(self.symbol).get_dividend_share())
        dividend_paydate = self.q.put(Share(self.symbol).get_dividend_pay_date())
        dividend_yield = self.q.put(Share(self.symbol).get_dividend_yield())

        return marketcap, bookvalue, dividend, dividend_paydate, dividend_yield



def main():
    q = multiprocessing.Queue()
    Stock1 = Stock('aapl', q) 


    p1 = multiprocessing.Process(target = Stock1.current_value(), args = (q,))
    p2 = multiprocessing.Process(target = Stock1.fundems(), args = (q,))
    p1.start()
    p2.start()
    p1.join()
    p2.join()

    while q.empty() is False:
        print q.get()


if __name__ == '__main__':
    main()

我得到的输出如下:

Process Process-2:
Traceback (most recent call last):
  File "/usr/lib/python2.7/multiprocessing/process.py", line 258, in _bootstrap
    self.run()
  File "/usr/lib/python2.7/multiprocessing/process.py", line 114, in run
    self._target(*self._args, **self._kwargs)
TypeError: 'tuple' object is not callable
139.52
732.00B
25.19
2.28
2/16/2017
1.63

这里我看到我能够得到我想要的输出,但在那个之前有一个错误,这让我感到困惑。

有人能帮我理解一下这里的概念吗?

提前谢谢。


解决方案

target应该是未调用的函数,您正在父进程中调用该函数,并尝试以调用结果作为目标启动Process。更改:

p1 = multiprocessing.Process(target = Stock1.current_value(), args = (q,))
p2 = multiprocessing.Process(target = Stock1.fundems(), args = (q,))

收件人:

p1 = multiprocessing.Process(target=Stock1.current_value)
p2 = multiprocessing.Process(target=Stock1.fundems)

q作为参数被删除,因为该对象是使用q构造的,并且使用其自己的状态来访问它,而不是将其作为每个方法的参数接收。

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