def Semaphore(*args, **kwargs):
return _Semaphore(*args, **kwargs)<EOL>
A factory function that returns a new semaphore.

    Semaphores manage a counter representing the number of release() calls minus
    the number of acquire() calls, plus an initial value. The acquire() method
    blocks if necessary until it can return without making the counter
    negative. If not given, value defaults to 1.