Find Key with Maximum Value in Dictionary

Discover the Key in the Dictionary That Has the Highest Value

Even if there are dictionaries inside dictionaries, this walkthrough will teach you how to use Python methods to locate the dictionary key that corresponds to the entry that has the greatest value in the dictionary that has been provided. A further topic that will be covered is the process of extracting the key to a dictionary from a list of dictionaries. In this section, we will learn how to achieve this goal by using the built-in operator, the max() function, and Python’s list comprehensions.

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Using max() Function

The max() function is the most straightforward approach to determining the highest possible value that may be stored in a Python dictionary. With the function, we are able to determine the highest value of any iterable.

Let’s first take a look at how a Python dictionary works when working with a list before going on to a more difficult scenario involving the use of the dictionary. Code

Output:

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The.values() method that is built into Python dictionaries retrieves the values from the dictionary that is supplied as an argument. Using this approach will result in us getting a list that contains all of the dictionary values. Likewise, if we make use of the.keys() function, we will get all of the keys. By making use of the zip() method, we are able to map each value to the corresponding key. It is necessary for us to provide the max() function with the outcome of the procedures described previously. Code

Output:

The key with the maximum value is:  2

While working with Python dictionaries, it is helpful to have the ability to acquire the dictionary key that correlates with the highest value.

The max() method in Python has support for a parameter known as the key = parameter. This parameter accepts a function that returns a value for each iterable data type that is sent to it. The procedure for finding the key for the maximum value is made easier by using this approach. It is possible that we will merely pass it in so that a function may evaluate it. Code

Output:

The key with the maximum value is:  2

To acquire the highest possible value stored in a Python dictionary, one may make use of the.get() method, which is also a built-in function of dictionaries in Python. You may recall that the.get() method is called whenever the value of a key is requested to be returned. See what transpires when we apply this approach to our key = parameter, and see what the results are. Code

Output:

The key with the maximum value is:  2

Getting the Key of Max Value from a List of Dictionaries

Over the course of your job, you could find that you refer to lists and dictionaries rather often. It would be important to know how to find the maximum value for each dictionary that is included in the list of dictionaries when faced with circumstances like these.

Putting this together is not at all difficult! First, we will utilize a technique called a for-loop, and then we will switch to using a list comprehension. To begin, let’s have a look at the for-loop approach: code

Output:

The key with the maximum value is:  4

This may also be rewritten as a list comprehension, and here are some examples:

Output:

The key with the maximum value is:  4

Finding the Key of Max Value in a Nested Dictionary

In order to do this particular job, we can make use of the for loop concept to iterate over each key in the dictionary and locate the nested key within the provided nested dictionary that has the highest value.

The main dictionary’s keys will be iterated through in the outer for-loop, and the nested dictionaries’ keys will be iterated over in the inner loop, both with the goal of finding the key that corresponds to the highest possible value. At the end, we will use the output as the main key, and the nested key that has the highest value will serve as the secondary key. Code

Output:

The keys of nested dictionary with maximum value are: ['2', 'd']