[Tutor] I am having difficulty grasping 'generators'

[Degreat Yartey]

I am studying python on my own (i.e. i am between the beginner and
intermediate level) and i haven't met any difficulty until i reached the
topic 'Generators and Iterators'.
I need an explanation so simple as using the expression 'print ()', in this
case 'yield'.
Python 2.6 here!
Thank you.
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