What are Generators ?
                  A generator in Python is a special type of function that produces values one at a time instead of returning them all at once.

Generators use the yield keyword instead of return .


Syntax :

Python 
def generator_name(): yield value


The yield Keyword :

The yield keyword is what makes a function a generator.

When yield is encountered, the function's state is saved, and the value is returned. The next time the generator is called, it continues from where it left off.


Example :

Python 
def my_generator(): yield 1 yield 2 yield 3 gen = my_generator() for value in gen: print(value) #output 1 2 3

Using next() with Generator :

Python 
def numbers(): yield 10 yield 20 g = numbers() print(next(g)) print(next(g)) #output 10 20

Generator vs List :

List stores all values in memory. Generator produces values one-by-one.


send( ) method : The send() method allows you to send a value to the generator:

Python 
def echo_generator(): while True: received = yield print("Received:", received) gen = echo_generator() next(gen) # Prime the generator gen.send("Hello") gen.send("World") #output Received: Hello Received: World


close( ) method : The close() method stops the generator:

Python 
def my_gen(): try: yield 1 yield 2 yield 3 finally: print("Generator closed") gen = my_gen() print(next(gen)) gen.close() #output 1 Generator closed