1.dic = {key:value,key:value}
字典有{ }括住，字典的value可以是任意值，字典的key的值不包括列表和字典
di = {"age":18,"name":"john","a":True,"b":[1,2,"movie"],"c":(1,2,"ff",)}
print(di)
运算结果：
{‘age‘: 18, ‘name‘: ‘john‘, ‘a‘: True, ‘b‘: [1, 2, ‘movie‘], ‘c‘: (1, 2, ‘ff‘)}
Process finished with exit code 0
2.取值（只能通过索引的方式，不能用切片的方式。因为字典是无序的）
di = {"age":18,"name":"john","a":True,"b":[1,2,"movie"],"c":(1,2,"ff",)}
v = di["c"][0]
print(v)
运行结果：
1
Process finished with exit code 0
3.删除
di = {"age":18,"name":"john","a":True,"b":[1,2,"movie"],"c":(1,2,"ff",)}
del di["b"][2]
print(di)
运行结果：
{‘age‘: 18, ‘name‘: ‘john‘, ‘a‘: True, ‘b‘: [1, 2], ‘c‘: (1, 2, ‘ff‘)}
Process finished with exit code 0
4.循环（只能用for循环，不能用while，因为字典是无序的）
di = {"age":18,"name":"john","a":True,"b":[1,2,"movie"],"c":(1,2,"ff",)}
for k,v in di.items():
print(k,v)
运行结果：
age 18 name john a True b [1, 2, ‘movie‘] c (1, 2, ‘ff‘) Process finished with exit code 0
5.方法
-根据序列创建字典并指定统一的值
a= dict.fromkeys(["age",123,"465"],222) print(a)
运行结果：
{‘age‘: 222, 123: 222, ‘465‘: 222}
Process finished with exit code 0
-根据key取值，如果没有key，则为none
dic = {"a":1,"b":3}
v = dic.get("a")
print(v)
运行结果：
1
Process finished with exit code 0
-删除
dic = {"a":1,"b":3}
v = dic.pop("a")
print(v)
print(dic)
运行结果：
1 {‘b‘: 3} Process finished with exit code 0
-随机删除
dic = {"a":1,"b":3}
v = dic.popitem()
print("删除的值为：",v)
print(dic)
运行结果：
删除的值为： (‘b‘, 3) {‘a‘: 1} Process finished with exit code 0
-设置，如果设置的值不存在，则创建新的，如果存在，不设置，直接获取当前的值
dic = {"a":1,"b":3}
v = dic.setdefault("c",132)
print(v)
print(dic)
运行结果：
132 {‘a‘: 1, ‘b‘: 3, ‘c‘: 132} Process finished with exit code 0
-添加
第一种方法：
dic = {"a":1,"b":3}
v = dic.update({"c":"456"})
print(dic)
运行结果：
{‘a‘: 1, ‘b‘: 3, ‘c‘: ‘456‘}
Process finished with exit code 0
第二种方法：
dic = {"a":1,"b":3}
v = dic.update(c=123,d=456)
print(dic)
运行结果：
{‘a‘: 1, ‘b‘: 3, ‘c‘: 123, ‘d‘: 456}
Process finished with exit code 0
原文：https://www.cnblogs.com/liujinjing521/p/11107070.html