Python字典dict用法

xiaoming_dict = {"name": "小明"}
# 1.取值
print(xiaoming_dict["name"])  # 輸出小明的名字
# 2.增加/修改
xiaoming_dict["age"] = 18  # 增加
xiaoming_dict["name"] = "小華"  # 修改
print(xiaoming_dict)
# 3.刪除
xiaoming_dict.pop("name")  # 刪除指定元素
print(xiaoming_dict)
# 4.統計鍵值對的數量
xiaoming_len = len(xiaoming_dict)
print(xiaoming_len)
# 5.合併字典
temp_dict = {"height": 1.75,
             "age": 20}
xiaoming_dict.update(temp_dict)  # 如果有重複會覆蓋原有的鍵值對
print(xiaoming_dict)
# 6.清空字典
xiaoming_dict.clear()
print(xiaoming_dict)
# 7.迭代遍歷輸出字典
for k in xiaoming_dict:  # k是每次迴圈中獲得的鍵值對的key
    print("%s - %s" % (k, xiaoming_dict[k]))

輸出:
小明
{‘name’: ‘小華’, ‘age’: 18}
{‘age’: 18}
1
{‘age’: 20, ‘height’: 1.75}
{}