Method to get all the keys with maximum value in a dictionary in python
In this article we will discuss about different methods to get all the keys with maximum value in a dictionary. Let us see all these methods one by one.

Method 1Using max() function and d.get
As the name suggests max function is used to find the maximum value. Let us see what is max() function in python and how it works.
max() function
The max() function returns the item with the highest value or the item with the highest value in an iterable. Normally we pass iterables in the max() function to get the max value in iterable but as we know dictionary has both keys and values so we have to pass an extra argument in the max() function to get the keys with max value in a dictionary.
Syntax: max(iterable,key=d.get) where d denotes the name of the dictionary.
It returns the item with maximum value in the Iterable.
So with the help of the max() function and d.get argument we can easily find the key with max value in a dictionary.
d = {"a": 1, "b": 2, "c": 3,"d":4} max_key = max(d, key=d.get) print(max_key)
Output
d
Here we see that corresponding to key “d” we get max value so this function return d as the output.
There is a small problem with this method. Let see the problem and see the method to solve the problem.
Problem
The problem with this method is that if in the dictionary multiple keys have max value then this method only returns the key that occurs first in the dictionary. Let see this with the help of an example.
d = {"a": 1, "b": 2, "c":4,"d":4} max_key = max(d, key=d.get) print(max_key)
Output
c
In the dictionary, we see that the dictionary has max value 4 corresponds to key c and d still function only return c as the output because c comes first in the dictionary. So this is the main problem with this method.
So if there is a problem so solution also exists. As this problem occurs with all the methods so after study all the methods we can discuss the solution to the problem.
Method 2Using max function() and operator
As we have already discussed max() function now we will discuss the operator module in python and how to use it in our program to get key with maximum value.
operator module
The operator module exports a set of efficient functions corresponding to the intrinsic operators of Python. For example, operator.add(x,y) is equivalent to the expression x+y.
Let see with an example how we can achieve our objective with the help of max and operator module.
import operator d={"a":1,"b":2,"c":3,"d":4} max_key = max(d.items(), key = operator.itemgetter(1))[0] print(max_key)
Output
d
So here is an example of how with using the max() function and operator module we get a key with maximum value in the dictionary. Here also a similar problem arises that if we have multiple keys with max value so the function returns the only key with the first occurrence.
The solution to the above problem
In both the method we see that how we only get one key if we have multiple keys with max value. So let discuss the solution. We can be done this task with the help of a single iteration over the dictionary. As we get almost one key that corresponds to the max value in the dictionary. So we can take the help of the key to get max value. Now we can iterate over the dictionary and check the key having max value and store these keys in a list and then print the list. Let see this with the help of an example.
d = {"a": 1, "b": 2, "c":4,"d":4} max_key = max(d, key=d.get) val=d[max_key] l=[] for key in d: if(d[key]==4): l.append(key) print(l)
Output
['c', 'd']
So here we see how we can easily print a list of keys having max value.
So these are the methods to get key with max value in a python dictionary.