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2023-08-24 10:31:27 +08:00
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3.编程思维体系构建/3.6.4.5阶段五：迭代生成.md
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@@ -37,7 +37,7 @@ iterator = iter(iterable)
# do something
```
- 首先，在可迭代对象上调用内置 `iter` 函数以创建对应的<em>迭代器</em>。
- 首先，在可迭代对象上调用内置 `iter` 函数以创建对应的*迭代器*。
- 要获取序列中的下一个元素，在此迭代器上调用内置 `next` 函数。
如果没有下一个元素了，怎么办？
@@ -76,7 +76,7 @@ StopIteration
## 英语练习，对迭代器的类比
<strong>Analogy</strong>: An iterable is like a book (one can flip through the pages) and an iterator for a book would be a bookmark (saves the position and can locate the next page). Calling `iter` on a book gives you a new bookmark independent of other bookmarks, but calling `iter` on a bookmark gives you the bookmark itself, without changing its position at all. Calling `next` on the bookmark moves it to the next page, but does not change the pages in the book. Calling `next` on the book wouldn't make sense semantically. We can also have multiple bookmarks, all independent of each other.
**Analogy**: An iterable is like a book (one can flip through the pages) and an iterator for a book would be a bookmark (saves the position and can locate the next page). Calling `iter` on a book gives you a new bookmark independent of other bookmarks, but calling `iter` on a bookmark gives you the bookmark itself, without changing its position at all. Calling `next` on the bookmark moves it to the next page, but does not change the pages in the book. Calling `next` on the book wouldn't make sense semantically. We can also have multiple bookmarks, all independent of each other.
## 生成器：懒人迭代器!