dict = {key: value}

變量 = set(list); ---> s = set([1, 2, 4])

註：dict、set的key必須是不可變對象。

區別：1、dict有value，set沒有

2、set可以做交集&，並集| 運算，dict 不能

一、dirct

#!/usr/bin/python

#initialize

dict = {'you':95, 'love':20, 'me':5}; # 若存在dict = {'you', 'love':， :8} 格式是錯誤的，key:value要配齊

#add a key

dict['too'] = 1;
print dict;

#delete a key, its value also delete
dict.pop('love');
print dict;

#a way of check in dict
print 'you' in dict; #格式：key in dict;

#other way of check in dict
print dict.get('haha'); #當key不存在，默認返回None ,若存在返回value

print dict.get('you', 1);

二、set

#!/usr/bin/python

#initialize

s = set([1, 2, 3, 4, 4]); #key重復會自動合並
print s;

#add
s.add(5);
print s;

#delete
s.remove(4);
print s;

# & / |
s1 = set([1, 2, 3]);
s2 = set ([2, 4, 5]);
s3 = s1 & s2;
print s3;
print s1 | s2;

list = ['y', 'o', 'u', 'l', 'o'];
q = set(list);
print q;

tuple = ('1', '2', '3');
x = set(tuple);
print x;

#error way

tuple = ('1', '2', '3');
x = set(tuple);
print x;

可見set並不支持混合的key。

鏈表：dict