字典
爲什麼需要字典:當列表中的值比較多的時候,通過列表下標來查找修改列表中的值很明顯存在着莫大的缺點:隨着列表中元素的增多,出現錯誤的概率也會增大
字典是通過鍵值對來進行存儲的,在查找訪問的時候很方便
dict = {"name":"zhangsan","age":18,"addr":"QINGDAO"}
print("name = %sm,\tage = %d,\taddress = %s"%(dict["name"],dict["age"],dict["addr"]))
dict["school"] = "OUC"
print(dict)
dict["school"] = "SD"
print(dict)
del dict["school"]
print(dict)
print(dict.get("name"))
print(len(dict))
print(dict.keys())
print(dict.values())
print(dict.items())
a = (11,22)
b,c = a
print("b = %d,c = %d"%(b,c))
for a,b in dict.items():
print("key = %s,value = %s"%(a,b))