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def fibonacci(number):
    """
    An example for generator function using yield.
    """
    result = 0
    base = 1
    while (result <= number):
        """ yield : sort of jump to parent calling function todo some processing 
        there and return back to the called function and resume the code execution.
        """
        yield result
        
        n = result + base
        result = base
        base = n
        
def main():
    for x in fibonacci(27):
        print x
    
if __name__ == '__main__':
    main()


    

    




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