Yield Keyword

[6pathsMadara]

Below is the code I have done following a tutorial, it involves creating a generator that makes the Fibonacci sequence, and then prints it out for values under 100. My problem that I have is I don't understand why I am using 'yield a' and what this does. Code is below:

def fib(): a = 0 b = 1 while True: yield a a = b b = a + b for f in fib(): if f > 100: break print(f)

You capture the value (a from fib in your loop) returned by fib, but don't do anything with it except for the last iteration. you should save it to a list, or print out results immediately: to list:

 def fib(): a = 0 b = 1 while True: yield a a = b b = a + b fibs = [] for f in fib(): fibs.append(f) if f > 100: break print(fibs) 

immediate:

 def fib(): a = 0 b = 1 while True: yield a a = b b = a + b for f in fib(): print('{}, '.format(f), end = '') if f > 100: break print() 

But I still don't understand what yield does, when i remove it, the code doesn't do anything, there's no errors but it doesn't do anything, but I still don't understand it's functionality.