The join() method in thread class blocks the calling thread until the thread whose join() method is called terminates. The termination may be either normal, because of an unhandled exception − or until the optional timeout occurs. It can be called many times. The join() raises a RuntimeError if an attempt is made to join the current thread. Attempt to join() a thread before it has been started also raises the same exception.
Syntax
Parameters
-
timeout − it should be a floating point number specifying a timeout for which the thread is to be blocked.
The join() method always returns None. you must call is_alive() after join() to decide whether a timeout happened − if the thread is still alive, the join() call timed out. When the timeout argument is not present or None, the operation will block until the thread terminates.
A thread can be joined many times.
Example
is_alive() method
This method returns whether the thread is alive. It returns True just before calling run() method and until just after the run() method terminates.
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