Question

如果我有一个python类

from multiprocessing import Process

class A(Process):
    def run(self):
        self.var = "asdf"

    def pprint(self):
        print(self.var)

if __name__ == "__main__":
    foo = A()
    foo.start()
    foo.pprint()
    bar = A()
    bar.pprint()

我收到了追溯错误

Traceback (most recent call last):
  File "simple.py", line 13, in <module>
    foo.pprint()
  File "simple.py", line 8, in pprint
    print(self.var)
AttributeError: 'A' object has no attribute 'var'

我可以访问在run函数中定义的实例变量，并在类的范围内定义其他函数吗？

Answer 1

from multiprocessing import Process

class A(Process):  
  def __init__(self, value):
    self.var = value  
  def run(self):
    self.var = "asdf"
  def pprint(self):
    print(self.var)


foo = A("asdf")
foo.start()
foo.pprint()
bar = A("qwerty")
bar.pprint()

Answer 2

run()函数在另一个进程中执行，变量仅在那里创建，而pprint()在当前进程中执行。你可以，例如使用Manager获取dict来存储所有进程通用的数据或使用管道或队列交换数据（阅读相关文档）。

如何创建访问在子类python进程的run函数中创建的变量的函数

2 个答案: