Python字典操作详解:如何增删查改字典
在Python中,字典是一种可变容器模型,它通过键(key)来存储和访问数据。接下来我们将详细讨论如何增删查改字典。
添加项 (Add Items)
直接插入 (Direct Insert)
dict_name = {"key1": "value1", "key2": "value2"}
dict_name["key3"] = "value3"
通过键值对添加 (Add by Key-Value Pair)
dict_name = {}
dict_name["key3"] = "value3"
删除项 (Delete Items)
直接删除 (Direct Delete)
dict_name = {"key1": "value1", "key2": "value2"}
del dict_name["key3"]
通过键值对删除 (Delete by Key-Value Pair)
dict_name = {"key1": "value1", "key2": "value2"}
del dict_name["key3"]
查找项 (Find Items)
直接查询 (Direct Query)
dict_name = {"key1": "value1", "key2": "value2"}
if "key3" in dict_name:
print("Key3 found")
else:
print("Key3 not found")
更新项 (Update Items)
直接更新值 (Direct Update Value)
dict_name = {"key1": "value1", "key2": "value2"}
dict_name["key1"] = "new_value1"
通过键值对更新 (Update by Key-Value Pair)
dict_name = {"key1": "value1", "key2": "value2"}
dict_name["key1"] = "new_value1"
以上就是Python字典增删查改的基本操作。在实际编程中,根据需要灵活运用这些操作技巧。
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