deffind_key_by_value(d,target_value):forkey,valueind.items():ifvalue==target_value:returnkeyreturnNone my_dict={'a':1,'b':2,'c':3}result=find_key_by_value(my_dict,2) Output: b In this example, we define a function calledfind_key_by_valuethat takes a dictionary and a target ...
遍历字典并使用集合(set)来存储所有的键,然后找出重复的键。这种方法适用于较小的字典。 代码语言:python 代码运行次数:0 复制 deffind_duplicate_keys(dictionaries):all_keys=set()duplicate_keys=set()fordictionaryindictionaries:forkeyindictionary.keys():ifkeyinall_keys:duplicate_keys.add(key)else:all_key...
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...
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...
deffind_key(d, val):returnnext(keyforkey, valueind.items()ifvalue == val) d = {'Bob':1,'Mary':2,'Lisa':4,'Ken':5,'Vivi':2}print(find_key(d,2)) 输出: Mary 11、将两个列表组合为一个字典 这里有两个列表,第一个列表存放键,第二个列表存放值,要将这两个列表转换为一个字典。
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...
File "<stdin>", line 1, in <module> RuntimeError: dictionary changed size during iteration #结果抛出异常了,两个0的元素,也只删掉一个。 >>> d {'a': 1, 'c': 1, 'd': 0} >>> d = {'a':1, 'b':0, 'c':1, 'd':0} ...
# 新dictionary：value: key inverted_dict = {value: key for key, value in d.items()} find_...
在Python中,字典(Dictionary)是一种通过键(key)来存储和访问值(value)的数据结构。然而,字典并不直接支持通过值来查找键。但你可以通过以下几种方法实现通过值查找键的功能: 1. 遍历字典 遍历字典的每一项,检查值是否匹配。如果找到匹配的值,则记录对应的键。 python def find_key_by_value(dictionary, value):...
'find', 'format', 'index', 'isalnum', 'isalpha', 'isdigit', 'islower', 'isspace', 'istitle', 'isupper', 'join', 'ljust', 'lower', 'lstrip', 'partition', 'replace', 'rfind', 'rindex', 'rjust', 'rpartition', 'rsplit', 'rstrip', 'split', 'splitlines', 'startswith', '...