Harmony and Relax

yield就相当于往一个list中塞东西而已（初步这么感觉），只不过写法很奇怪罢了。呵呵

>>> def kk(x):
...     yield x
...     yield x+7
...     yield x*2
...
>>> b = kk(14)
&g...

1.1 A Simple Example Extending and Embedding the Python Interpreter Previous: 1. Extending Python with Up: 1. Extending Python with Next: 1.2 Intermezzo: Errors and
1.1 A Simple Example ...

when we run python script, such as a.py, we always see the process (eg: ps -A) is "python", not "a.py", how to solve it:
#!/usr/bin/env python
procname = 'Hello'

import os, sys
if not os.environ.has_key('N...

 比如这么一句：^A Why miss out?^B^R^P
那些^A, ^B这些什么隐含字符其实是我parse网页后留下的，现在想把这些隐含字符给替换替换掉（或者削掉）
以前用perl是可以这样的：
$str =~ s/[\cA-\cI\cK\cL\cN-\cZ]//gi;
于是就得到Why miss out?了
现在得用python完成这一替换，尝试了一下：re.compile(r"[\cA-\c...

def RemoveNonNullDirectory (top):
    """
    Remove non-null directory
    """
    while 1:
        ...

# This class provides the functionality we want. You only need to look at
# this if you want to know how this works. It only needs to be defined
# once, no need to muck around with its internals.
class switch(object):
def __init...

python中提供了很便捷的方法来判断两个文件的内容是否相同，只要两行代码：
import filecmp
filecmp.cmp(r'e:\1.txt',r'e:\2.txt')
如果两个文件相同，会输出True，否则会输出false。

This has been a problem for a long time for me. Whenever someone enters a title in my CMS the id of the document is derived from the title. Spaces are replaced with '- and &' is replaced with and etc. The final thing I wanted to do was to make s...

出于适当的需要，有几种通常在功能性语言和Lisp中出现的功能加入到了Python。通过lambda关键字，可以创建很小的匿名函数。这里有一个函数返回它的两个参数的和：“lambda a, b: a+b”。 Lambda 形式可以用于任何需要的函数对象。出于语法限制，它们只能有一个单独的表达式。语义上讲，它们只是普通函数定义中的一个语法技巧。类似于嵌套函数定义，lambda形式可以从包含范围内引用变量：

语法： lambda argument1, ar...

问题：
     Python的函数定义中有两种特殊的情况，即出现*，**的形式。
     如：def myfun1(username, *keys)或def myfun2(username, **keys)等。

解释：
  * 用来传递任意个无名字参数，这些参数会一个Tuple的形式访问。

   **用来处理传递任...

3.9 File Objects File objects are implemented using C's stdio package and can be created with the built-in constructor file() described in section 2.1, ``Built-in Functions.''3.6 File objects are also returned by some other bu...

###########################################################
特殊字符:
###########################################################
"." 匹配除 "\n" 之外的任何单个字符。要匹配包括 '\n' 在内的任何字符，请使用象 '[.\n]' 的模式。
"^&quot...

3.6.1 String Methods These are the string methods which both 8-bit strings and Unicode objects support:

8 -bit字符串和unicode对象支持这些字符串方法

 

capitalize( ) Return a copy of the string with only its fi...

原文:http://docs.python.org/lib/node39.html
 4.1.1 String constants 

The constants defined in this module are:

该模块包含这些常量：

 

ascii_letters The concatenation of the ascii_lowerc...

import os
str = os.popen("dir").read()
a = str.split("\n")
for b in a:
   print b

import   os  
  path   =   'c:\windows'  
  e   =   os.path.exists(path)  
  print   e     #   True

 那如果是要判断文件而不是目录呢？

 os.p...

和C字符串不同，Python字符串不能改写。按字符串索引赋值会产生错误。

>>> word[0] = 'x'
Traceback (most recent call last):
File "", line 1, in ?
TypeError: object doesn't support item assignment
>>> word[:1]...