难以理解的“嵌套”理解。循环以与理解相同的顺序展开。
[leaf for branch in tree for leaf in branch]
这样有助于你进行思考。
for branch in tree: for leaf in branch: yield leaf

难以理解的“嵌套”理解。循环以与理解相同的顺序展开。
[leaf for branch in tree for leaf in branch]
这样有助于你进行思考。
for branch in tree: for leaf in branch: yield leaf