# -*- coding: gb2312 -*-
"""
Created on Tue Sep 29 23:12:01 2015
@author: Administrator
"""
"""列表推导和字典推导 求偶数数组
numbers=[1,2,3,4,5,6]
even = [i for i in numbers if i%2==0]
print "列表中的偶数列表：",even
even1 = [i*2 for i in numbers]
print "列表中的元素*2：",even1
"""
"""链式比较
a=7
if 1< a< 10:
print "判断一个值是否在一定范围内：if i<a<10"
"""
"""for...else 语法
num = [1,2,3,4,5,-1]
for i in num:
if i<0:
break
print i
else:
print "列表数据都为正数"
"""
"""集合操作
a = {1,2,3,4}
b = {4,5,6,7}
print "a|b",a|b
print "a&b",a&b
"""