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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序列運算
|
77
Python
語
言
行為就像是對於串列特定切片的指定動作。在表 3-3 中，
L
代表任何串列物
件，
i
代表
L
中任何有效的索引，
s
是任何 iterable，而
x
是任何物件。
表 3-3 串列物件的方法
方法 說明
非變動式
L .count( x )
回傳
L
中與
x
相等的項目之數量。
L .index( x )
回傳
L
中第一個與
x
相等的項目之索
引，或是在
L
中沒有這種項目時提出一
個例外。
變動式
L .append( x )
將項目
x
附加（append）到
L
的尾端，
等同於
L[len(L):]=[x]
。
L .extend( s )
將 iterable
s
的所有項目附加到
L
的尾
端，等同於
L[len(L):]=s
或
L += s
。
L.insert(i, x)
將項目
x
插入到
L
中位於索引
i
的項目
的前面，後續的項目（如果有的話）會
「往右移」以空出位置（將
len(L)
加
一，不會取代任何項目，不會提出例
外，行為等同於
L[i:i]=[x]
）。
L .remove( x )
移除
L
中第一個與
x
相等的項目，或在
L
沒有這種項目時提出一個例外。
L.pop(i=-1)
回傳位於索引
i
的項目之值，並將它從
L
移除；當你省略
i
，移除並回傳的會是
最後一個項目；如果
L
是空的或
i
不是
L
中的有效索引，就會提出一個例外。
L .reverse()
就地反轉（reverse）
L
中項目的順序。
L.sort(cmp=cmp, key=None, reverse=False)
就地排序（sort）
L
中的項目，僅限於
v2，以傳入作為
cmp
的函式（預設是內
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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.