创建具有相同文件名变量的线程通过python

Question

我希望能够一次选择多个文件并使用subprocess命令运行它们，并认为使用线程是最好的。 这是我的代码：

i=0
IMLCPath = raw_input("Enter the path for IMLC: ")
Path_to_execute = raw_input("Enter the path where IMLC has to be executed: ")
NumberofThreads =raw_input("Enter the number of threads to be run in parallel: ")

def foo(filename):
    subprocess.call(['imlc.exe', filename],shell=True)

def Capture():
    global i
    for filename in glob.glob(os.path.join(Path_to_execute, '*.xml')):
        os.chdir(IMLCPath)
        D = threading.Thread(target = foo, args = (filename,))
        D.start()
        if i%float(NumberofThreads) == 0:
            D.join()


if __name__ == '__main__':
    Capture() 

但是当我运行它时，同一文件名被运行两次（如果NumberofThreads = 2）。我该如何解决？应该从该文件夹中取出2个文件，然后同时运行它们