Coroutines

def searcher():
    print("entered into searcher()")
    import time
    #some time consuming task
    book="this book is about a famous software developer mr.N.Harish"
    time.sleep(3)
    while True:
        text=(yield) #this means i want use this function 'searcher' as coroutine. now it is not a function it is coroutine
        print("started using function 'searcher' as coroutine ")
        if text in book:
            print("text is in the book")
        else:
            print("text is not in the book")
search=searcher() #instance of searcher coroutine
print("search started")
if __name__=='__main__':
    next(search) #start coroutine from text=(yield)
    print("next method run")
    search.send("software harish")#send values to coroutine
    input("enter any key:")
    search.send("Harish")
    print(type(search))
    search.close() #after this you cannot send any value