Python基礎--字典(dictionary)
阿新 • • 發佈:2018-06-13
字典 dictionary 1.字典的定義,鍵唯一,值隨意
dic={key0:value0,key1:value1}
2.輸出
print(dic[key0])
>>:value0
3.遍歷字典
3.1keys()遍歷字典中的key
dic={‘name‘:‘zhangsan‘,‘age‘:20}
for k in dic.keys():
print(k)
>>:
name
age
3.2values()遍歷字典中的value
dic={‘name‘:‘zhangsan‘,‘age‘:20} for v in dic.values(): print(v) >>: zhangsan 20
3.3items()遍歷字典中的key,value
dic={‘name‘:‘zhangsan‘,‘age‘:20}
for k,v in dic.items():
print(k+‘:‘+str(v))
>>:
name:zhangsan
age:20
4.字典插入元素
dic={‘name‘:‘zhangsan‘,‘age‘:20}
dic[‘job‘]=‘python‘
print(dic)
>>:
{‘name‘: ‘zhangsan‘, ‘age‘: 20, ‘job‘: ‘python‘}
5.根據鍵修改值
dic={‘name‘:‘zhangsan‘,‘age‘:20} dic[‘name‘]=‘lisi‘ print(dic) >>: {‘name‘: ‘lisi‘, ‘age‘: 20}
6.pop()刪除字典中的元素
dic={‘name‘:‘zhangsan‘,‘age‘:20}
dic.pop(‘name‘)
print(dic)
>>:
{‘age‘: 20}
7.判讀元素是否在字典中:
dic={‘name‘:‘zhangsan‘,‘age‘:20}
tmp=‘name‘
if tmp in dic:#和 if tmp in dic.keys()相同:
print("%s in dic" %tmp)
#判斷元組是否在值中
if tmp in dic.values():
print("%s in dic" %tmp)
Python基礎--字典(dictionary)