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Message: [QUOTE="bonono, post: 1849356"] this makes me "jump" from the list comprehension to the function, harder to follow than 'in place', especially when the function is simple, it is not necessary. What is the reason for introducing list comprehension and then later, generator expression when : a=[] for x in range(8): a.append(describe(x%2)) return a and for x in range(8): yield describe(x%2) can do the same thing ? Doesn't it violate the general idiom that it better has one and only one way to do certain thing ? I believe part of the reason is that one doesn't need to "jump" up and down. Now that is obsession for(and bad use of) one-liner. But picking a bad example of one liner to rule out its effectiveness and readability is a stretch I would say. [/QUOTE]