How do you return a value from a thread in Python?
pool import ThreadPool pool = ThreadPool(processes=1) async_result = pool. apply_async(foo, (‘world’, ‘foo’)) # tuple of args for foo # do some other stuff in the main process return_val = async_result. get() # get the return value from your function.
How do you return a thread value?
The thread that needs to return the value uses the Callable interface to implement the call method; Before getting the future object, you can use the isDone() method to check whether the future is complete. After that, you can call the get() method to get the value of the future.
What does a thread return?
tl;dr a thread cannot return a value (at least not without a callback mechanism). You should reference a thread like an ordinary class and ask for the value.
What is the thread function in Python?
Threading in python is used to run multiple threads (tasks, function calls) at the same time. Note that this does not mean that they are executed on different CPUs. Python threads will NOT make your program faster if it already uses 100 % CPU time. In that case, you probably want to look into parallel programming.
How do you return in Python?
The Python return statement is a special statement that you can use inside a function or method to send the function’s result back to the caller. A return statement consists of the return keyword followed by an optional return value. The return value of a Python function can be any Python object.
How do you return a value in Python?
A return statement is used to end the execution of the function call and “returns” the result (value of the expression following the return keyword) to the caller. The statements after the return statements are not executed. If the return statement is without any expression, then the special value None is returned.
How does thread call method return value?
Threads do not really have return values. However, if you create a delegate, you can invoke it asynchronously via the BeginInvoke method. This will execute the method on a thread pool thread. You can get any return value from such as call via EndInvoke .
Which function is used to return a value from the thread back to the main process in Linux?
pthread_exit()
pthread_exit() is used to return a value from the thread back to the main process.
How do threads work?
Threads are sometimes called lightweight processes because they have their own stack but can access shared data. Because threads share the same address space as the process and other threads within the process, the operational cost of communication between the threads is low, which is an advantage.
How many threads can I run Python?
This means that in python only one thread will be executed at a time. By only allowing a single thread to be used every time we run a Python process, this ensures that only one thread can access a particular resource at a time and it also prevents the use of objects and bytecodes at once.
How do you return a string and an integer in Python?
To convert a string to integer in Python, use the int() function. This function takes two parameters: the initial string and the optional base to represent the data. Use the syntax print(int(“STR”)) to return the str as an int , or integer.
How do I return a list?
To return a list, first create the list object within the function body, assign it to a variable your_list , and return it to the caller of the function using the keyword operation “ return your_list “.