January 2018
Intermediate to advanced
856 pages
17h 17m
Chinese
Content preview from Python 技術手冊 第三版
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第 3 章 Python 語言
break 述句
break
述句只能用於迴圈主體（loop body）中。
break
執行的時候，迴圈就
終止。如果一個迴圈內嵌在其他迴圈中，一個
break
述句只會終止最內層
的迴圈。實務上，一個
break
通常會出現在迴圈主體中的一個
if
的子句裡
面，所以那個
break
是條件式執行的。
break
的一個常見用途是實作會在每次迴圈迭代（loop iteration）的半途
中判斷是否要繼續迴圈的迴圈（Knuth 在他 1974 年的開創性論文（
http://
www.kohala.com/start/papers.others/knuth.dec74.html
）中稱之為「loop and a
half」結構，在該文中，他也首次提出使用縮排，而非分隔符號，作為表
達程式結構的裝置，就跟 Python 一樣）。舉例來說：
while True: # 這個迴圈永遠無法自然地終止
x = get_next()
y = preprocess(x)
if not keep_looping(x, y): break
process(x, y)
continue 述句
continue
述句只能出現在迴圈主體中。
continue
執行的時候，迴圈主體
目前的迭代（iteration）就會終止，而執行會接續到迴圈的下次迭代。實
務上，一個
continue
通常會放在迴圈主體中一個
if
的子句中，所以那個
continue
會條件式地執行。
有的時候，一個
continue
述句可以用來取代迴圈中巢狀的 ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.