[docs] [issue21739] Add hint about expression in list comprehensions (https://docs.python.org/2/tutorial/datastructures.html#list-comprehensions)

[Ezio Melotti]

Ezio Melotti added the comment:

If we don't want to go into the details of why it's not equivalent, using "roughly equivalent" might be enough.

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keywords: +easy
nosy: +ezio.melotti
stage:  -> needs patch
type:  -> enhancement

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