acquire(self, timeout=None)
If the internal counter is greater than zero, decrement it by one and return True immediately. If it is zero, wait until a release() is called and return True.
Seconds to wait on acquiring the semaphore. This does not include local coroutine time, network transfer time, etc.. Instead of number of seconds, it is also possible to specify a timedelta in string format, e.g. "200ms".
Acquire a semaphore.
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