1.字典的操作
字典一种key - value 的数据类型，使用就像我们上学的字典，通过笔画，字典来查对应页的详细内容。
语法：
info = {
'student1101' : "hanjiali",
'student1102' : "hanjiali1",
'student1103' : "hanjiali2",
}
info = {
'student1101' : "hanjiali",
'student1102' : "hanjiali1",
'student1103' : "hanjiali2",
}
print(info)
print("-----------------------------------")
#查（存在的情况下不出错，不存在报错）
print(info["student1101"])
print("-----------------------------------")
#查（标准方法）
print(info.get("student1101"))
print("-----------------------------------")
#试一个人在不在
print("student1104" in info )
#输出T or F
print("-----------------------------------")
print("-----------------------------------")
#改
info["student1101"] = "韩佳丽"
print(info)
print("-----------------------------------")
#删1(标准删除)
info.pop('student1103')
print(info)
print("-----------------------------------")
#删2
del info["student1102"]
print(info)
print("-----------------------------------")
运行结果：
{'student1101': 'hanjiali', 'student1102': 'hanjiali1', 'student1103': 'hanjiali2'}
-----------------------------------
hanjiali
-----------------------------------
hanjiali
-----------------------------------
False
-----------------------------------
{'student1101': '韩佳丽', 'student1102': 'hanjiali1', 'student1103': 'hanjiali2'}
-----------------------------------
{'student1101': '韩佳丽', 'student1102': 'hanjiali1'}
-----------------------------------
{'student1101': '韩佳丽'}
-----------------------------------
2.字典的嵌套
ar_cata = {
"homework" : {
'stud_1101': ["认真完成"],
'stud_1102': ["很差"],
'stud_1103': ["尽最大努力"],
},
"class" : {
's_1101': ["上课注意力集中"],
's_1102': ["不听课"],
's_1103': ["还可以"],
},
"student" : {
'1101' : "hanjiali",
'1102' : "hanjiali1",
'1103' : "hanjiali2",
}
}
ar_cata["student"]["1103"] = "马瑞龙"
print(ar_cata)
print("-----------------------------------")
#创建新的
ar_cata.setdefault("地区",["内蒙古"])
print(ar_cata)
运行结果：（尽量不写中文，怕字符转换出错）
{'homework': {'stud_1101': ['认真完成'], 'stud_1102': ['很差'], 'stud_1103': ['尽最大努力']}, 'class': {'s_1101': ['上课注意力集中'], 's_1102': ['不听课'], 's_1103': ['还可以']}, 'student': {'1101': 'hanjiali', '1102': 'hanjiali1', '1103': '马瑞龙'}}
-----------------------------------
{'homework': {'stud_1101': ['认真完成'], 'stud_1102': ['很差'], 'stud_1103': ['尽最大努力']}, 'class': {'s_1101': ['上课注意力集中'], 's_1102': ['不听课'], 's_1103': ['还可以']}, 'student': {'1101': 'hanjiali', '1102': 'hanjiali1', '1103': '马瑞龙'}, '地区': ['内蒙古']}
3.字典的合并
info = {
'student1101' : "hanjiali",
'student1102' : "hanjiali1",
'student1103' : "hanjiali2",
}
b = {
'student1101': "hanjiali",
1 : 3,
2 : 2
}
info.update(b)
print(info)
#转化成列表
print("---------------------------------------------------------------")
print(info.items())
结果：
{'student1101': 'hanjiali', 'student1102': 'hanjiali1', 'student1103': 'hanjiali2', 1: 3, 2: 2}
---------------------------------------------------------------
dict_items([('student1101', 'hanjiali'), ('student1102', 'hanjiali1'), ('student1103', 'hanjiali2'), (1, 3), (2, 2)])
4.字典的循环
info = { 'student1101' : "hanjiali", 'student1102' : "hanjiali1", 'student1103' : "hanjiali2", } b = { 'student1101': "hanjiali", 1 : 3, 2 : 2 } info.update(b) print(info) print("---------------------------------------------------------------") print(info.items()) for i in info : print(i,info[i])
输出结果：
student1101 hanjiali student1102 hanjiali1 student1103 hanjiali2 1 3 2 2
