Built-in practice: map()

In this exercise, you'll practice using Python's built-in map() function to apply a function to every element of an object. Let's look at a list of party guests:

names = ['Jerry', 'Kramer', 'Elaine', 'George', 'Newman']

Suppose you wanted to create a new list (called names_uppercase) that converted all the letters in each name to uppercase. you could accomplish this with the below for loop:

names_uppercase = []

for name in names:
  names_uppercase.append(name.upper())

['JERRY', 'KRAMER', 'ELAINE', 'GEORGE', 'NEWMAN']

Let's explore using the map() function to do this more efficiently in one line of code.

This is a part of the course

“Writing Efficient Python Code”

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Exercise instructions

Use map() and the method str.upper() to convert each name in the list names to uppercase. Save this to the variable names_map.
Print the data type of names_map.
Unpack the contents of names_map into a list called names_uppercase using the star character (*).
Print names_uppercase and observe its contents.

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

# Use map to apply str.upper to each element in names
names_map  = ____(____, ____)

# Print the type of the names_map
print(____(____))

# Unpack names_map into a list
names_uppercase = [____]

# Print the list created above
print(____)

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