http://docspy3zh.readthedocs.org/en/latest/index.html
http://wiki.ubuntu.org.cn/Python_%E5%AE%98%E6%96%B9%E7%AE%80%E6%98%8E%E6%95%99%E7%A8%8B
各种类型内置函数汇总:
http://docspy3zh.readthedocs.org/en/latest/library/stdtypes.html#typesseq