I am using Python 2.7. I want to create an instance of an object, and call a method within it in a separate process. Something like this:
import subprocesss
class A
def doAwork(self, text):
print text
class B
def doBWork
aInst = A()
subprocess(A.dowork("called from doBwork"))
Can this be done, or, do I need to turn around and call python as a subprocesss?
Edit: I can not use threads for this. The method called in aInst in reality loads a non-thread safe dll.
Thanks
You have to use the multiprocessing module instead of subprocess
Simple example copied from documentation link above:
from multiprocessing import Process
def f(name):
print 'hello', name
if __name__ == '__main__':
p = Process(target=f, args=('bob',))
p.start()
p.join()
With your example it would look like this:
from multiprocessing import Process
class A:
def doAwork(self, text):
print text
class B:
def doBweork(self):
aInst = A()
p = Process(target=aInst.doAwork("called from doBWork")
p.start()
p.join()
Functionality within this package requires that the __main__ module be importable by the children. Probably the main module is in this case your C++ program, and so it gets started. But I have not used python from C++ yet, so I can't answer this now. (If I find something I will update my answer)multiprocessing http://docs.python.org/2/library/multiprocessing.html The Process class will give you all you need
subprocess is used to spawn a process (EXE on windows) and not a function. In this case, you may use threads:
import thread
class A:
def doAwork(self, text):
print text
class B:
def doBwork(self):
aInst = A()
thread.start_new_thread(aInst.doAwork, ("called from doBwork",))
B().doBwork()
