9.1 第一个例子
#!/usr/bin/python3
dict = {}
dict['haha'] = "hehe"
dict[2] = 3343
print (dict['haha'])
print (dict[2])
print (dict)
print (dict.keys())
print (dict.values())结果：
hehe
3343
{'haha': 'hehe', 2: 3343}
dict_keys(['haha', 2])
dict_values(['hehe', 3343])
9.2 获取字典元素个数
#!usr/bin/python3
d = {"1": "haha", "2": "hehe"}
print("len(d) = ", len(d))结果：
len(d) = 2
