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Learn to program with Python

Looping through lists with zip #

We can loop through multiple sequences, such as strings, lists, or tuples with zip().

Here's what happens when you call the zip() function with multiple lists:

list_a = [1,2,3]
list_b = [4,5,6]
print(list(zip(list_a, list_b)))
# [(1, 4), (2, 5), (3, 6)]

From the example above, we call the function zip() with two lists. The function then returns us a list of tuples, each tuple contains two elements from each list.

With this knowledge, we can now loop through multiple lists with for loop, zip(), and data unpacking:

names = ['John', 'Alice', 'Bob']
ages = [30, 25, 35]

for name, age in zip(names, ages):
    print(f"{name} is {age} years old")

Output:
John is 30 years old
Alice is 25 years old
Bob is 35 years old

We can also loop more than 3 lists at the same time as well:

names = ['John', 'Alice', 'Bob']
ages = [30, 25, 35]
countries = ['USA', 'Canada', 'UK']

combined = zip(names, ages, countries)
for name, age, country in combined:
    print(name, age, country)

Exercise #

Combine the values in the lists students and scores into a new list results.

Tests #

  • Variable results should be ['Rhonda Hart: 60', 'Ernest Aguirre: 70', 'Sean Jackson: 80']
  • Use zip() function

Hints #

Each element in results should be a string in the format "{student}: {score}". For example, "Rhonda Hart: 60".

Output will be displayed here