英文:
How to use variables of run method in other methods of a process class in python
问题
如何在Process类的其他方法中使用在'run'方法内创建的变量（复杂对象）？
我理解在run方法内创建或修改的变量的作用范围仅限于该方法本身，但是否有办法解决这个问题？
这是我的示例代码：
import multiprocessing as mp
class DummyCls:
def __init__(self):
self.name = "Hii"
class MyProcess(mp.Process):
def __init__(self):
super().__init__()
self.my_object = None
def run(self):
self.my_object = DummyCls()
self.my_object.name = "Hello"
def get_name(self):
print(self.my_object.name)
if __name__ == '__main__':
my_process = MyProcess()
my_process.start()
my_process.get_name()
my_process.join()
我收到以下错误：
print(self.my_object.name)
AttributeError: 'NoneType' object has no attribute 'name'
英文:
How to use a variable(Complex Object) created inside 'run' method in other methods of the Process class?
I understood the scope of variables created or modified inside run method is limited within itself, but is there any way to crack this ?
This is my sample code,
import multiprocessing as mp
class DummyCls:
def __init__(self):
self.name = "Hii"
class MyProcess(mp.Process):
def __init__(self):
super().__init__()
self.my_object = None
def run(self):
self.my_object = DummyCls()
self.my_object.name = "Hello"
def get_name(self):
print(self.my_object.name)
if __name__ == '__main__':
my_process = MyProcess()
my_process.start()
my_process.get_name()
my_process.join()
I'm getting error stating that,
> print(self.my_object.name)
> AttributeError: 'NoneType' object has no attribute 'name'
答案1
得分: 1
my_process.my_object 从未被实例化，因为 my_process.run() 从未被调用。
修复的方法之一是将以下内容添加到您的 if __name == '__main__' 中：
my_process = MyProcess()
my_process.start()
my_process.run() # 新增
my_process.get_name()
my_process.join()
英文:
my_process.my_object is never instantiated, because my_process.run() is never called.
One way to fix it would be to add the following to your if __name == '__main__':
my_process = MyProcess()
my_process.start()
my_process.run() # new
my_process.get_name()
my_process.join()
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