笔记|python字典的增删查改

info = {"id":1,"name":"黄同学","age":18}# ''' # 增 # newID= input("请输入新的学号:") # info["id"] =newID # print(info["id"]) # '''#删 #[del] #[clear] 清空 # print("删除前: %s"%info["name"]) # del info["name"] #删除指定的键值对,会报错 #print("删除后: %s"%info["name"]) # print("删除前:%s"%info) # # del info # print("删除后:%s"%info)# print("清空前:%s"%info) # # info.clear() # print("清空后:%s"%info)#改 # # info["age"]=20 # # print(info["age"])#查 遍历 # print(info.keys()) #得到所有的键 # print(info.values()) #得到所有的值 # # print(info.items()) #得到所有的项#遍历所有的值 # # for key in info.keys(): #print(key) # for value in info.values(): #print(value)# for key,value in info.items(): #print("key=%s,value=https://www.it610.com/article/%s"%(key,value))#使用枚举函数,同时拿到列表中的下标和元素内容 # mylist = ["a","b","c","d"] # # # for i,x in enumerate(mylist): #print(i+1,x)

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