my_dict={'a':1,'b':2,'c':3,'d':1}value_to_find=2key=find_key_by_value(my_dict,value_to_find)ifkeyisnotNone:print(f"The key corresponding to value{value_to_find}is{key}.")else:print(f"The value{value_to_find}does not exist in the dictionary.") 1. 2. 3. 4. 5. 6...
def find_key_by_value(dictionary, search_value): for key, value in dictionary.items(): if value == search_value: return key rAIse ValueError("Value does not exist in the dictionary") 三、创建反向字典 当你需要频繁地通过值来查找键时,可以考虑创建一个反向字典,其中值作为键,原始键作为值。这样...
2:'B', 3:'C'} # 新dictionary：value: keyinverted_dict= {value: key for key, value in d...
def find_value(dictionary, target_key): for key, value in dictionary.items(): if key == target_key: return value elif isinstance(value, dict): result = find_value(value, target_key) if result is not None: return result return None # 示例字典 my_dict = { 'a': 1, 'b': { 'c'...
target_value):forkey,valueindictionary.items():ifvalue==target_value:returnkey# 如果找不到匹配的...
In simple terms, a Python dictionary can store pairs of keys and values. Each key is linked to a specific value. Once stored in a dictionary, you can later obtain the value using just the key. For example, consider the Phone lookup, where it is very easy and fast to find the phone ...
def find_key_in_list_of_dicts(target_value, list_of_dicts): for dictionary in list_of_dicts: if target_value in dictionary.values(): return dictionary.keys()[list(dictionary.values()).index(target_value)] return None # 示例用法 list_of_dicts = [ {"name": "Alice", "age": 25}, ...
A Python dictionary consists of a collection of key-value pairs, where each key corresponds to its associated value. In this example, "color" is a key, and "green" is the associated value.Dictionaries are a fundamental part of Python. You’ll find them behind core concepts like scopes and...
在Python中,可以使用字典(Dictionary)数据结构来存储一组键值对。字典是一种可变、无序且可嵌套的数据类型,其中的键(Key)必须是唯一的,而值(Value)可以是任意类型的数据。 要根据名称在Python字典中查找一组值,可以使用字典的get()方法。该方法接受一个键作为参数,并返回与该键关联的值。如果键不存在于字典中,则...
deffind_key_by_value(dictionary,value):forkey,valindictionary.items():ifval==value:returnkeyreturnNonestudent={'name':'Alice','age':18,'grade':'A'}key=find_key_by_value(student,'Alice')print(key)# 输出:name 1. 2. 3. 4.