It's a list comprehension with an implicit nested loop: >>> [y for z in [[1,2,3]... | Hacker News

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		lisper on March 27, 2016 \| parent \| context \| favorite \| on: Comprehensions in Python the Jedi way It's a list comprehension with an implicit nested loop: `>>> [y for z in [[1,2,3],[4,5,6]] for y in z] [1, 2, 3, 4, 5, 6]` The error you get is because "planet" is bound by the second FOR clause, so when you leave it out, planet becomes unbound.

andreasvc on March 27, 2016 [–]

The term nested list comprehension is used differently here: https://docs.python.org/3/tutorial/datastructures.html#neste...

Don't know what a better term might be, but it's good to be aware of the distinction.

lisper on March 27, 2016 | [–]

Good point. I fixed it.

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