Python 中进程之间不共享实例变量

class Main:     def __init__(self):          self.Foo_Instance = Foo()          multiprocessing.Process(target=self.Foo_Instance.do_something).start()     def Change_Foo(self):          Foo_Instance.ImportantVar = True    class Foo:     def __init__(self):          self.ImportantVar = False     def do_something(self):          passMain_Instance = Main()Main_Instance.Change_Foo()

import multiprocessingimport ctypesimport timeclass main:    def __init__(self):        self.foo_instance = foo()        multiprocessing.process(target=self.foo_instance.do_something).start()    def change_foo(self):        # wait for foo.do_something to have printed out its initial value:        self.foo_instance.initial_print_event.wait()        # modify the attribute (add missing self):        self.foo_instance.importantvar.value = true        # show that we have modified the attribute:        self.foo_instance.changed_event.set()class foo:    def __init__(self):        self.importantvar = multiprocessing.value(ctypes.c_bool, false, lock=false)        self.initial_print_event = multiprocessing.event()        self.changed_event = multiprocessing.event()    def do_something(self):        print('do_something before:', self.importantvar.value)        # show that we have completed printing our initial value:        self.initial_print_event.set()        # now wait for main.change_foo to have changed our variable:        self.changed_event.wait()        print('do_something after:', self.importantvar.value)# required for windows:if __name__ == '__main__':    main_instance = main()    main_instance.change_foo()

do_something before: Falsedo_something after: True