https://docs.python.org/2.7/library/index.html
# -*- coding: UTF-8 -*-
缩进indent
raw_input
tuple() list[] dict{key:value} set([])
if ():
for i in range(len(L)):
for value in d.itervalues():
for k,v in d.iteritems():
from collections import Iterable
isinstance
slice [:]
for i,value in enumerate(['a','b','c']):