5.1 starting...

cookbook/c05/__init__.py

@@ -0,0 +1,7 @@
+#!/usr/bin/env python
+# -*- encoding: utf-8 -*-
+"""
+Topic: sample
+Desc : 
+"""
+

cookbook/c05/p01_rw_text.py

@@ -0,0 +1,22 @@
+#!/usr/bin/env python
+# -*- encoding: utf-8 -*-
+"""
+Topic: 读写文本文件
+Desc : 
+"""
+
+def rw_text():
+    # Iterate over the lines of the file
+    with open('somefile.txt', 'rt') as f:
+        for line in f:
+            # process line
+            print(line)
+
+    # Write chunks of text data
+    with open('somefile.txt', 'wt') as f:
+        f.write('text1')
+        f.write('text2')
+
+if __name__ == '__main__':
+    rw_text()
+

source/c05/p01_read_write_text_data.rst

@@ -5,14 +5,69 @@
 ----------
 问题
 ----------
-todo...
+你需要读写各种不同编码的文本数据，比如ASCII，UTF-8或者UTF-16编码等。
+
+|
 
 ----------
 解决方案
 ----------
-todo...
+使用带有rt模式的open()函数读取文本文件。如下所示：
+
+.. code-block:: python
+
+    # Read the entire file as a single string
+    with open('somefile.txt', 'rt') as f:
+        data = f.read()
+
+    # Iterate over the lines of the file
+    with open('somefile.txt', 'rt') as f:
+        for line in f:
+            # process line
+            ...
+
+类似的，为了写入一个文本文件，使用带有wt模式的open()函数，如果之前文件内容存在则清除并覆盖掉。如下所示：
+
+.. code-block:: python
+
+    # Write chunks of text data
+    with open('somefile.txt', 'wt') as f:
+        f.write(text1)
+        f.write(text2)
+        ...
+
+    # Redirected print statement
+    with open('somefile.txt', 'wt') as f:
+        print(line1, file=f)
+        print(line2, file=f)
+        ...
+
+如果是在已存在文件中添加内容，使用模式为at的open()函数。
+
+文件的读写操作默认使用系统编码，可以通过调用sys.getdefaultencoding()来得到。
+在大多数机器上面都是utf-8编码。如果你已经知道你要读写的文本是其他编码方式，
+那么可以通过传递一个科学的encoding参数给open()函数。如下所示：
+
+.. code-block:: python
+
+    with open('somefile.txt', 'rt', encoding='latin-1') as f:
+        ...
+
+Python支持非常多的文本编码。几个常见的编码是ascii, latin-1, utf-8和utf-16。
+在web应用程序中通常都使用的是UTF-8。
+ascii对应从U+0000到U+007F范围内的7位字符。
+latin-1是字节0-255到U+0000至U+00FF范围内Unicode字符的直接映射。
+当读取一个未知编码的文本时使用latin-1编码永远不会产生解码错误。
+使用latin-1编码读取一个文件的时候也许不能产生完全正确的文本解码数据，
+但是它也能从中提取出足够多的有用数据。同时，如果你之后将数据回写回去，原先的数据还是会保留的。
+
+|
 
 ----------
 讨论
 ----------
-todo...
+Reading and writing text files is typically very straightforward. However, there are a
+number of subtle aspects to keep in mind. First, the use of the with statement in the
+examples establishes a context in which the file will be used. When control leaves the
+with block, the file will be closed automatically. You don’t need to use the with statement,
+but if you don’t use it, make sure you remember to close the file:

source/chapters/p05_files_and_io.rst

@@ -2,12 +2,9 @@
 第五章：文件与IO
 =============================
 
-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.
+所有程序都要处理输入和输出。
+这一章将涵盖处理不同类型的文件，包括文本和二进制文件，文件编码和其他相关的内容。
+对文件名和目录的操作也会涉及到。
 
 Contents: