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 7 章 核心內建功能和標準程式庫模組
本書的第三與第四部涵蓋其他的 Python 標準程式庫模組。
內建型別
表 7-1 涵蓋了 Python 的核心內建型別，例如
int
、
float
、
dict
與其他許多
型別。有關這些型別和在它們實體上進行的運算之更多細節，可在第 3 章
中找到。在本節中，提到「數字（number）」時，我們表示的是「非複數
（noncomplex number）」。
表 7-1 核心內建型別
bool bool(x=False)
如果
x
估算（evaluate）為假值（false），就回傳
False
；如果
x
估算為真
值（true），就回傳
True
。（參閱前面的「Boolean 值 」。）
bool
擴充
int
：
內建名稱
False
與
True
參考的是
bool
唯二的實體。那些實體也是
int
，分
別等於
0
與
1
，但
str(True)
是
'True'
，
str(False)
是
'False'
。
bytearray bytearray(x=b''[,codec[,errors]])
位元組
（bytes，值從
0
到
255
的
int
）組成的一個可變序列，支援可變
序 列（mutable sequences）的一般方法，加上
str
（涵蓋於表 7-1）
的方法。如果
x
是 v3 中的
str
實體，或是 v2 中的
unicode
實體，你也
必須傳入
codec
，還可以傳入
errors
，結果就會跟呼叫
<bytearray(x.
encode(codec,errors))
一樣。當
x
是一個
int
，它必須
>=0
：所產生的實
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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.