字典的定义和操作

字典包含hash值和指向的对象。{‘length’：180,‘width’：80}

示例1：

#给字典增加一个对象和hash值：

dict1 = {'x':1,'y':2}

dict1['z'] = 3

print(dict1)

示例2：

chinese_zodiac = '猴鸡狗猪鼠牛虎兔龙蛇马羊'
cz_num = {}
n = 1
for i in chinese_zodiac:
    cz_num[i] = n
    n += 1

#打印字典的内容
print(cz_num)
#打印字典的对象
print(cz_num.keys())