Partitioning Lists Based on Conditions

When splitting a list into two based on a given condition, it's tempting to iterate over the list twice, creating two new lists as follows:

good = [x for x in mylist if x in goodvals]
bad = [x for x in mylist if x not in goodvals]

，[]，[] 對於mylist中的X： （不好，好）[x in goodvals] .append（x）

good, bad = [], []
for x in mylist:
    (bad, good)[x in goodvals].append(x)

emplent element emplance。 goodvals]要根據良好的條件x選擇適當的列表。

使用append方法將x附加到所選列表中。
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