markdown工具，可以将txt转化成html格式。这一类工具的作用是将按一定格式写成的可读性强的文本文件
转化为结构化的标准xhtml或html。markdown最初用perl写成，后来移植到python,java,php.这里主要
介绍下python-markdown的用法。
python-markdown模块使用有两个模式，一种是做为独立的命令行，另外一种是做为python的模块使用。
1. 命令行模式在Fedora下，命令行名称是markdown:
[ray@localhost markdown]$ markdown
Usage: markdown INPUTFILE [options]
Options:
-h, --help show this help message and exit
-f OUTPUT_FILE, --file=OUTPUT_FILE
write output to OUTPUT_FILE
-e ENCODING, --encoding=ENCODING
encoding for input and output files
-q, --quiet suppress all messages
-v, --verbose print info messages
-s SAFE_MODE, --safe=SAFE_MODE
same mode ('replace', 'remove' or 'escape' user's
HTML tag)
--noisy print debug messages
-x EXTENSION, --extension=EXTENSION
load extension EXTENSION
使用起来很简单， 直接运行markdown input.txt > output.html即可。例如：
[ray@localhost markdown]$ cat notes.txt
Who am I?
===========
This is Ray Chen speaking.
Where am I from?
====================
I'm from SH, China. I love this place.
What's next?
=================
* nothing
* sleep
* study
* reading book
[ray@localhost markdown]$ markdown notes.txt > notes.html
[ray@localhost markdown]$ cat notes.html
Who am I?
This is Ray Chen speaking.
Where am I from?
I'm from SH, China. I love this place.
What's next?
nothing
sleep
study
reading book
2. 模块用法
[ray@localhost markdown]$ cat test_markdown.py
#!/usr/bin/python
import markdown
import codecs
# Open input file in read, utf-8 mode
input_file = codecs.open("notes.txt", mode="r", encoding="utf8")
text = input_file.read()
html = markdown.markdown(text)
# print
print html
# Write string html to disk
output_file = codecs.open("notes_py.html", mode="w", encoding="utf8")
output_file.write(html)
[ray@localhost markdown]$ python test_markdown.py
Who am I?
This is Ray Chen speaking.
Where am I from?
I'm from SH, China. I love this place.
What's next?
nothing
sleep
study
reading book
[ray@localhost markdown]$ cat notes_py.html
Who am I?
This is Ray Chen speaking.
Where am I from?
I'm from SH, China. I love this place.
What's next?
nothing
sleep
study
reading book
后记：
markdown工具在很多程序中用到，比如说wordpress, pybb等，特别适合wiki， blog，forum等。
参考：
http://blog.rogerz.cn/archives/401
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