Python 3.3.0 于2012-09-29发布。下载地址：https://www.python.org/downloads/
pythonic是充分利用python语言特性，写出优雅的代码。
>>> import this The Zen of Python, by Tim Peters Beautiful is better than ugly. Explicit is better than implicit. Simple is better than complex. Complex is better than complicated. Flat is better than nested. Sparse is better than dense. Readability counts. Special cases aren't special enough to break the rules. Although practicality beats purity. Errors should never pass silently. Unless explicitly silenced. In the face of ambiguity, refuse the temptation to guess. There should be one-- and preferably only one --obvious way to do it. Although that way may not be obvious at first unless you're Dutch. Now is better than never. Although never is often better than *right* now. If the implementation is hard to explain, it's a bad idea. If the implementation is easy to explain, it may be a good idea. Namespaces are one honking great idea -- let's do more of those!
常用pythonic
变量值交换：a, b = b, a
列表推导：50以内能被2整除的数：[x*x for x in range(50) if x % 2 == 0]
字符串拼接：''.join(list_words), 必须为字符串列表。
字符串反转：
>>> s = "python"
>>> s[::-1]
'nohtyp'
其他：迭代器，装饰器，生成器等。