# Python find the key of a dictionary with maximum value

## Introduction :

In this tutorial, we will learn how to find the key of a dictionary with maximum value in python. We will learn different ways to solve this problem. In these examples, we will use one predefined dictionary.

Python dictionary is used to store *key-value* pairs. Using the keys, we can access the values. Finding out the largest key is easy, but finding out the largest value and the key associated with it is a little bit tricky.

## Method 1: Find using the maximum key :

In this approach, we will find out the largest value at first. Then, we will find out the key for that value.

dict = {"a" : 11, "b" : 2, "c" : 10, "d" : 14} values = list(dict.values()) keys = list(dict.keys()) m = max(values) i = values.index(m) print(keys[i])

Here, *dict* is the given dictionary. *values* hold the list of all dictionary values and *keys* holds the list of all dictionary keys. *m* is the maximum of all values in the dictionary and *i* is the index of the maximum value. In the final line, we are printing the key of the maximum value.

## Method 2: Using operator :

Using *operator* module, it requires only one line :

import operator dict = {"a" : 11, "b" : 2, "c" : 10, "d" : 14} maxValue = max(dict.items(), key = operator.itemgetter(1))[0] print(maxValue)

It will print the same output.

## Method 3 : Using max() :

If you don’t want to import any extra module, you can simply use the python *max()* function. This function is defined as below :

max(iterable[, default, key]) -> value

It takes three arguments, one *iterable* and two more optional arguments *default* and *key*.

- iterable: It is an iterable object. This is always required.
- default: This is the default value to return if the first argument
*iterable*is empty. This is an optional argument. - key: Optional argument. This is a function that is applied to each value of the iterable. Using this function, we can change the way it works.

It returns the maximum item found in the iterable. If *the key* is provided, it will find the maximum value with natural ordering. Else, it will use the *key* function to find out the maximum value.

Our goal is to find out the maximum *value* and its *key* in a dictionary. We can use the dictionary *items()* method. It returns a list of all dictionary *key, value* pairs. Also, we will pass one function *lambda i : i[1])* as the *key* i.e. it will always compare the *second element* of each iterable element. It will return the item with the largest second value.

dict = {"a" : 1, "b" : 2, "c" : 10, "d" : 14} print(max(dict.items(),key = lambda i : i[1]))

If you execute this program, it will print the below output :

('d', 14)

### Method 4: Get only the key using max() :

Method *3*, as we have seen above, can be used to get both *key-value* pairs with the maximum value in a dictionary. But, if you need only the *key*, you can pass the dictionary as the *first* argument and *dict.get* as the second argument. It looks like as below :

dict = {"a" : 1, "b" : 2, "c" : 10, "d" : 14} print(max(dict,key = dict.get))

It will print *d* as the output.

*get()* is used to get the value for a key. Using it, *max()* finds the key with the largest value.

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