You can use the following syntax to find the index of the max value of a list in Python:
#find max value in list max_value = max(list_name) #find index of max value in list max_index = list_name.index(max_value)
The following examples show how to use this syntax in practice.
Example 1: Find Index of Max Value in List
The following code shows how to find the max value in a list along with the index of the max value:
#define list of numbers x = [9, 3, 22, 7, 15, 16, 8, 8, 5, 2] #find max value in list max_value = max(x) #find index of max value in list max_index = x.index(max_value) #display max value print(max_value) 22 #display index of max value print(max_index) 2
The maximum value in the list is 22 and we can see that it’s located at index value 2 in the list.
Note: Index values start at 0 in Python.
Example 2: Find Index of Max Value in List with Ties
The following code shows how to find the max value in a list along with the index of the max value when there are multiple max values.
#define list of numbers with multiple max values x = [9, 3, 22, 7, 15, 16, 8, 8, 5, 22] #find max value in list max_value = max(x) #find indices of max values in list indices = [index for index, val in enumerate(x) if val == max_value] #display max value print(max_value) 22 #display indices of max value print(indices) [2, 9]
The maximum value in the list is 22 and we can see that it occurs at index values 2 and 9 in the list.
Additional Resources
How to Zip Two Lists in Python
How to Convert a List to a DataFrame in Python
How to Plot Histogram from List of Data in Python
