A generator is a special type of function in Python which does not return a single value, instead it returns a sequence of values. Generators is an easier way to create iterators using a keyword yield from a function rather than a return keyword.
- Generators are defined with the def keyword.
- It uses the yield keyword.
- It can use several yield keyword.
- It returns an iterator.
Let us understand with an example:
def my_generator(x,y): while(x<=y): yield x x+=1 print(my_generator) #OUTPUT <function my_generator at 0x00F40810>
So whenever you will use yield keyword in a function it will become a generator. But how will you iterate? As generator returns an iterator, so you can iterate through iterator like example 2 :
def my_generator(x,y): while(x<=y): yield x x+=1 mygen = my_generator(1,5) for i in mygen: print(i) #OUTPUT 1 2 3 4 5
def my_generator(): name = 'Deepak' age = 30 dob = '18 October 1990' yield name yield age yield dob my_iter = my_generator() try: print(next(my_iter)) print(next(my_iter)) print(next(my_iter)) print(next(my_iter)) except StopIteration as ex: print("Iterator Stop!") #OUTPUT Deepak 30 18 October 1990 Iterator Stop!