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-- coding:utf-8 --

字典常用操作

字典的特点

1. 无序

2. 键值对

3. key唯一

4. 存储一个物体相关信息(对象)

xm = {"name":"xm",
"age":12,
"gender":True,
"higet":175,
"weight":75.5}

print(xm)

1. 取值 [key]

print(xm["age"])

2. 增/改 key 不存在则新增，存在则修改

xm["pp"] = 1
xm["name"] = 2
print(xm)

3. 删除

xm.pop("pp")
print(xm)

4.统计键值对的数量

print(len(xm))

5.合并字典 如果被合并的字典保护原有的key，会覆盖掉

td = {"d":"t","age":10}
xm.update(td)
print(xm)

清空字典

xm.clear()

print(xm.keys())

print(xm.values())

print(xm.fromkeys(1))

循环

for k in xm:
print(k)
print(xm[k])

常用场景

x = {"name":"x",
"age":12}

y = {"name":"y",
"age":15}

l1 = [x,y]

for d in l1:
print(d["name"])
print(d["age"])