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:


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for index, value in enumerate(sequence):
    # Your code here

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:

travel_list = ['Monako', 'Luxemburg', 'Liverpool', 'Barcelona', 'Munchen']

# Printing all cities with their indexes

for index, city in enumerate(travel_list):

print(str(index) + ' ' + city)


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travel_list = ['Monako', 'Luxemburg', 'Liverpool', 'Barcelona', 'Munchen']

# Printing all cities with their indexes
for index, city in enumerate(travel_list):
    print(str(index) + ' ' + city)

Task

Swipe to start coding

As a traveler, you have a list of potential destinations and want to assign a unique identifier to each one based on its position in the list.

Use the enumerate() function to iterate through the countries list.
Assign an ID number to each destination.
Store the results in a list where each entry follows the format: "<Country>-id#<Index>".


py
# Wales-id0

Solution

# Full list of countries you are considering for travel

countries = ['Wales', 'Denmark', 'Belgium', 'South Korea', 'Barcelona', 'South Africa', 'Indonesia', 'Singapore', 'Australia', 'India', 'Saudi Arabia', 'Mexico', 'Turkey', 'Greece', 'Netherlands', 'Tokyo', 'Finland', 'Monako', 'United Arab Emirates', 'Egypt', 'Morocco', 'Brazil', 'Argentina', 'Ireland', 'Portugal', 'Chile', 'Paris', 'Spain', 'Czech Republic', 'Sweden', 'Switzerland', 'Liverpool', 'Thailand', 'Luxemburg', 'New Zealand', 'France', 'Italy', 'Germany', 'New York', 'China', 'Munchen', 'Canada', 'Hungary', 'Scotland', 'Norway', 'Austria', 'Ukraine', 'Poland']

# Initialize an empty dictionary for rankings

travel_rankings = []

# Assign rankings using enumerate

for index, country in enumerate(countries):

travel_rankings.append(country + '-id#' + str(index))

# Testing

print('Travel destination rankings:', travel_rankings)

Everything was clear?

Thanks for your feedback!

Section 1. Chapter 6

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# Full list of countries you are considering for travel

countries = ['Wales', 'Denmark', 'Belgium', 'South Korea', 'Barcelona', 'South Africa', 'Indonesia', 'Singapore', 'Australia', 'India', 'Saudi Arabia', 'Mexico', 'Turkey', 'Greece', 'Netherlands', 'Tokyo', 'Finland', 'Monako', 'United Arab Emirates', 'Egypt', 'Morocco', 'Brazil', 'Argentina', 'Ireland', 'Portugal', 'Chile', 'Paris', 'Spain', 'Czech Republic', 'Sweden', 'Switzerland', 'Liverpool', 'Thailand', 'Luxemburg', 'New Zealand', 'France', 'Italy', 'Germany', 'New York', 'China', 'Munchen', 'Canada', 'Hungary', 'Scotland', 'Norway', 'Austria', 'Ukraine', 'Poland']

# Initialize an empty dictionary for rankings

travel_rankings = []

# Testing

print("Travel destination rankings:", travel_rankings)

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