The enumerate() Function

The enumerate() function is incredibly useful when you need to access both the value and its index in a sequence, such as a list or a string. This allows you to work with items while keeping track of their position in the sequence.

In Python, lists are ordered data structures, meaning each item has a unique index. The enumerate() function makes it easy to retrieve both the index and the value simultaneously.

The syntax for using enumerate() is:

index: refers to the position of an element in the list. Python uses 0-based indexing, meaning the first element has an index of 0;
value: refers to the actual element at a given index.

Let's apply enumerate() to our travel_list to print each city along with its index:


              123456
            
travel_list = ["Monako", "Luxemburg", "Liverpool", "Barcelona", "Munchen"]

# Printing all cities with their indexes
for index, city in enumerate(travel_list):
    print(f"{index} - {city}")

Task

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As a traveler, you have a long list of potential destinations, but you want to prioritize them based on their position in the list. To make this process easier, you decide to assign a priority ranking to each country.

Use the enumerate() function to go through the countries list.
Assign a ranking to each country, starting from 1.
Store the rankings in a dictionary where the country name is the key and the priority ranking is the value.

Solution

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Section 1. Chapter 6

The enumerate() Function

In Python, lists are ordered data structures, meaning each item has a unique index. The enumerate() function makes it easy to retrieve both the index and the value simultaneously.

The syntax for using enumerate() is:

index: refers to the position of an element in the list. Python uses 0-based indexing, meaning the first element has an index of 0;
value: refers to the actual element at a given index.

Let's apply enumerate() to our travel_list to print each city along with its index:


              123456
            
travel_list = ["Monako", "Luxemburg", "Liverpool", "Barcelona", "Munchen"]

# Printing all cities with their indexes
for index, city in enumerate(travel_list):
    print(f"{index} - {city}")

Task

Swipe to start coding

Use the enumerate() function to go through the countries list.
Assign a ranking to each country, starting from 1.
Store the rankings in a dictionary where the country name is the key and the priority ranking is the value.

Solution

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 1. Chapter 6

Switch to desktop for real-world practiceContinue from where you are using one of the options below