Multiple return values in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to return two values from the function.

Python

def get_coordinates():
    x = 10
    y = 20
    return [1]

Drag options to blanks, or click blank then click option'

A[x, y]

B(x + y)

Cx, y

Dx

Attempts:

3 left

💡 Hint

Common Mistakes

Returning a list instead of multiple values.

Returning only one value.

The function returns two values separated by a comma, which Python treats as a tuple.

2fill in blank

medium

Complete the code to unpack the returned values into variables.

Python

def get_name_and_age():
    return "Alice", 30

name, [1] = get_name_and_age()

Drag options to blanks, or click blank then click option'

Aage

Byears

Cvalue

Dinfo

Attempts:

3 left

💡 Hint

Common Mistakes

Using only one variable to unpack two values.

Using a variable name that doesn't match the returned data.

The function returns two values, so we unpack them into two variables: name and age.

3fill in blank

hard

Fix the error in the function to correctly return multiple values.

Python

def calculate():
    sum = 5 + 3
    diff = 5 - 3
    return [1]

Drag options to blanks, or click blank then click option'

A[sum, diff]

Bsum, diff

Csum + diff

D(sum)

Attempts:

3 left

💡 Hint

Common Mistakes

Returning a list instead of multiple values.

Returning the sum of the values instead of both separately.

Returning sum, diff returns both values as a tuple, which is the correct way to return multiple values.

4fill in blank

hard

Fill both blanks to create a function that returns the square and cube of a number.

Python

def powers(num):
    square = num [1] 2
    cube = num [2] 3
    return square, cube

Drag options to blanks, or click blank then click option'

A**

B*

C+

D//

Attempts:

3 left

💡 Hint

Common Mistakes

Using multiplication instead of exponentiation.

Using addition or floor division operators.

The exponent operator '**' is used to calculate powers in Python.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps words to their length if length is greater than 3.

Python

words = ["apple", "bat", "car", "door"]
lengths = { [1]: [2] for [3] in words if len([3]) > 3 }

Drag options to blanks, or click blank then click option'

Aword

Blen(word)

Attempts:

3 left

💡 Hint

Common Mistakes

Using the length as the key.

Not filtering words by length.

The dictionary comprehension uses the word as the key and its length as the value, filtering words longer than 3 characters.

Practice

1.

What does a Python function return when it has multiple values separated by commas in the return statement?

easy

A. A tuple containing all the returned values

B. A list containing all the returned values

C. Only the first value is returned

D. A dictionary with values as keys

Solution

1. Step 1: Understand Python return behavior

   When multiple values are separated by commas in a return statement, Python groups them into a tuple automatically.

2. Step 2: Identify the returned data type

   The returned object is a tuple containing all the values, not a list or dictionary.

3. Final Answer:

   A tuple containing all the returned values -> Option A

4. Quick Check:

   Multiple values returned = tuple [OK]

Hint: Multiple returns become a tuple automatically [OK]

Common Mistakes:

• Thinking it returns a list
• Assuming only one value is returned
• Confusing tuple with dictionary

2.

Which of the following is the correct syntax to return multiple values a and b from a function?

easy

A. return a, b

B. return {a: b}

C. return [a, b]

D. return {a, b}

Solution

1. Step 1: Review return syntax for multiple values

   Python allows returning multiple values separated by commas without parentheses.

2. Step 2: Compare options

   return a, b is correct and returns a tuple. return {a: b} returns a dictionary, return [a, b] returns a list, and return {a, b} returns a set, which are not typical for multiple return values.

3. Final Answer:

   return a, b -> Option A

4. Quick Check:

   Comma-separated values return tuple [OK]

Hint: Use commas without brackets to return multiple values [OK]

Common Mistakes:

• Using brackets unnecessarily
• Returning list or set instead of tuple
• Syntax errors with braces

3.

What will be the output of this code?

def get_values():
    return 5, 10

x, y = get_values()
print(x + y)

medium

A. 510

B. TypeError

C. 15

D. None

Solution

1. Step 1: Understand function return and unpacking

   The function returns two values 5 and 10 as a tuple. Variables x and y capture these values separately.

2. Step 2: Calculate the sum

   Adding x and y means 5 + 10 which equals 15.

3. Final Answer:

   15 -> Option C

4. Quick Check:

   5 + 10 = 15 [OK]

Hint: Unpack returned tuple into variables to use values [OK]

Common Mistakes:

• Concatenating numbers as strings
• Forgetting to unpack tuple
• Expecting a list instead of tuple

4.

Find the error in this code snippet:

def split_name(full_name):
    first, last = full_name.split()
    return first, last

f, l, m = split_name('John Doe')

medium

A. Missing return statement

B. Too many variables to unpack returned values

C. Function split_name returns a list, not tuple

D. split() method does not work on strings

Solution

1. Step 1: Analyze returned values and unpacking

   The function returns two values: first and last name. The caller tries to unpack into three variables.

2. Step 2: Identify mismatch in unpacking

   Trying to assign two returned values to three variables causes a ValueError due to too many variables to unpack.

3. Final Answer:

   Too many variables to unpack returned values -> Option B

4. Quick Check:

   Returned 2 values but unpacked into 3 variables [OK]

Hint: Match number of variables to returned values [OK]

Common Mistakes:

• Unpacking into more variables than returned
• Assuming split returns tuple always
• Ignoring ValueError messages

5.

Given this function that returns multiple values, how can you modify it to return the sum and product of a list of numbers?

def calculate(numbers):
    # Your code here

result = calculate([1, 2, 3, 4])
print(result)

Choose the correct implementation to return both sum and product.

hard

A. def calculate(numbers):
total = sum(numbers)
product = 0
for n in numbers:
product += n
return total, product

B. def calculate(numbers):
return sum(numbers) + product(numbers)

C. def calculate(numbers):
return [sum(numbers), product(numbers)]

D. def calculate(numbers):
total = sum(numbers)
product = 1
for n in numbers:
product *= n
return total, product

Solution

1. Step 1: Calculate sum and product correctly

   Sum is calculated using built-in sum(). Product requires initializing to 1 and multiplying each number.

2. Step 2: Return both values as multiple return values

   Return total and product separated by comma to return a tuple.

3. Final Answer:

   def calculate(numbers): total = sum(numbers) product = 1 for n in numbers: product *= n return total, product -> Option D

4. Quick Check:

   Return sum and product as tuple [OK]

Hint: Return sum and product separated by comma [OK]

Common Mistakes:

• Using product = 0 and adding instead of multiplying
• Trying to add sum and product instead of returning both
• Returning list instead of tuple