第1节完成

This commit is contained in:
XiongNeng
2014-08-31 12:05:40 +08:00
parent 5e420f6eeb
commit f3c94567ce
16 changed files with 673 additions and 12 deletions

2
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cookbook/__init__.py Normal file
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@@ -0,0 +1,7 @@
#!/usr/bin/env python
# -*- encoding: utf-8 -*-
"""
Topic: sample
Desc :
"""

7
cookbook/c01/__init__.py Normal file
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#!/usr/bin/env python
# -*- encoding: utf-8 -*-
"""
Topic: sample
Desc :
"""

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@@ -9,11 +9,15 @@
* 博客: http://yidao620c.iteye.com/
* GitHub https://github.com/yidao620c
|
|
|
*主要贡献者*
1. 夏丹 (767962863@qq.com)
2. 梁永威 (415320557@qq.com)
3. 莫浩文 (453166604@qq.com)
2. 张三 (zhangsan@gmail.com)
3. lisi (lisi@gmail.com)
|
|

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@@ -5,14 +5,79 @@
----------
问题
----------
You have an N-element tuple or sequence that you would like to unpack into a collection of N variables.
现在有一个包含N个元素的元祖或者是序列请问怎样将它里面的值解压后同时赋值给N变量
----------
解决方案
----------
Any sequence (or iterable) can be unpacked into variables using a simple assignment operation. The only requirement is that the number of variables and structure match the sequence. For example:
任何的序列(或者是可迭代对象)可以通过一个简单的赋值语句解压并赋值给多个变量。
唯一的前提就是变量的数量必须跟序列元素的数量是一样的。代码示例:
.. code-block:: python
>>> p = (4, 5)
>>> x, y = p
>>> x
4
>>> y
5
>>>
>>> data = [ 'ACME', 50, 91.1, (2012, 12, 21) ]
>>> name, shares, price, date = data
>>> name
'ACME'
>>> date
(2012, 12, 21)
>>> name, shares, price, (year, mon, day) = data
>>> name
'ACME'
>>> year
2012
>>> mon
12
>>> day
21
>>>
如果变量个数和序列元素的个数不匹配,会产生一个异常,代码示例:
.. code-block:: python
>>> p = (4, 5)
>>> x, y, z = p
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: need more than 2 values to unpack
>>>
----------
讨论
----------
Unpacking actually works with any object that happens to be iterable, not just tuples or lists. This includes strings, files, iterators, and generators. For example:
实际上,这种解压赋值可以用在任何可迭代对象上面,而不仅仅是列表或者元祖。
包括字符串,文件对象,迭代器和生成器。代码示例:
.. code-block:: python
>>> s = 'Hello'
>>> a, b, c, d, e = s
>>> a
'H'
>>> b
'e'
>>> e
'o'
>>>
有时候你可能只想解压一部分丢弃其他的值。对于这种情况Python并没有提供特殊的语法。
但是你可以使用任意变量名去占位,到时候丢掉这些变量就行了。代码示例:
.. code-block::python
>>> data = [ 'ACME', 50, 91.1, (2012, 12, 21) ]
>>> _, shares, price, _ = data
>>> shares
50
>>> price
91.1
>>>
你必须保证你选用的那些占位变量名在其他地方没被使用到。

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@@ -2,12 +2,11 @@
第一章:数据结构和算法
=============================
Python provides a variety of useful built-in data structures, such as lists, sets, and dictionaries.
For the most part, the use of these structures is straightforward. However,
common questions concerning searching, sorting, ordering, and filtering often arise.
Thus, the goal of this chapter is to discuss common data structures and algorithms
involving data. In addition, treatment is given to the various data structures contained
in the collections module.
Python提供了大量的内置数据结构,包括列表,集合以及字典。大多数情况下使用这些数据结构式很简单的。
但是,我们也会经常碰到到诸如查询,排序和过滤等等这些普遍存在的问题。
因此,这一章的目的就是讨论这些比较常见的问题和算法。
另外我们也会给出在集合模块collections当中操作这些数据结构的方法。
Contents: