items(): if value == target_value: return key return None 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 called find_key_by_value that takes a dictionary and a target value as arguments. ...
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...
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...
deffind_key_by_value(dictionary, value): forkey, valindictionary.items(): ifval==value: returnkey returnNone # 示例用法 my_dict={'a':1,'b':2,'c':3,'d':2} search_value=2 result=find_key_by_value(my_dict, search_value)
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.
# Iterate over the files in the current "root"forfile_entryinfiles:# create the relative path to the filefile_path = os.path.join(root, file_entry)print(file_path) 我们也可以使用root + os.sep() + file_entry来实现相同的效果,但这不如我们使用的连接路径的方法那样符合 Python 的风格。使用...
sht_2.range('B1').value=df 向表二中导入numpy数组 importnumpyasnpobj=np.array([[1,2,3],[4...
To sort a dictionary by its values in Python, you can use the sorted function with a lambda function as the key argument. A Python dictionary is a built-in data type that represents a collection of key-value pairs
1)、dictionary (字典) 是 除列表以外 Python 之中 最灵活 的数据类型 2)、字典同样可以⽤来 存储多个数据,常⽤于存储 描述⼀个 物体 的相关信息 3)、字典⽤ {} 定义 4)、字典使⽤ 键值对 存储数据,键值对之间使⽤ , 分隔 键key 是索引 ...