Tuple unpacking in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to unpack the tuple into variables a and b.

Python

t = (5, 10)
a, [1] = t
print(a, b)

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

Ax

Bc

Cb

Dy

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name not matching the tuple length causes errors.

Trying to unpack into only one variable.

The tuple t has two values. We unpack them into variables a and b. So b is the correct variable name to match the second value.

2fill in blank

medium

Complete the code to unpack the tuple and print the second value.

Python

coordinates = (3, 7)
x, [1] = coordinates
print(y)

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

Az

By

Ca

Db

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name different from the one printed causes NameError.

Unpacking into fewer or more variables than tuple length causes errors.

The tuple coordinates has two values. We unpack into x and y. To print the second value, the variable must be y.

3fill in blank

hard

Complete the code to unpack the tuple into variables a, b, and c.

Python

values = (1, 2, 3)
a, b, [1] = values
print(a, b, c)

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

Ac

Bd

Ce

Df

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name that doesn't match the print statement causes NameError.

Unpacking into the wrong number of variables causes ValueError.

The tuple values has three elements. Unpack them into variables a, b, and c so the print statement works correctly.

4fill in blank

hard

Fill both blanks to create a dictionary with keys as names in uppercase and values as ages over 20.

Python

people = {name[1]: age for name, age in data if age [2] 20}

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

A.upper()

B>

C<

D.lower()

Attempts:

3 left

💡 Hint

Common Mistakes

Using < instead of > for filtering.

Using .lower() instead of .upper() for keys.

The dictionary comprehension uses name.upper() to make keys uppercase and filters ages greater than 20 using age > 20.

5fill in blank

hard

Fill all three blanks to create a dictionary with keys as uppercase names, values as ages, filtered by age greater than 25.

Python

result = [1]: [2] for name, age in people if age [3] 25}

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

Aname.upper()

Bage

C>

Dname.lower()

Attempts:

3 left

💡 Hint

Common Mistakes

Using name.lower() instead of name.upper().

Using < instead of > for filtering.

Swapping keys and values in the dictionary comprehension.

The dictionary comprehension uses name.upper() as keys, age as values, and filters ages greater than 25 with age > 25.

Practice

1. What does tuple unpacking do in Python?
a, b = (1, 2)

easy

A. Raises an error because of wrong syntax

B. Creates a tuple with elements a and b

C. Swaps the values of a and b

D. Assigns 1 to a and 2 to b in one line

Solution

1. Step 1: Understand tuple unpacking syntax

   The code a, b = (1, 2) assigns the first value 1 to variable a and the second value 2 to variable b.

2. Step 2: Confirm the assignment

   After unpacking, a equals 1 and b equals 2, which matches the tuple elements.

3. Final Answer:

   Assigns 1 to a and 2 to b in one line -> Option D

4. Quick Check:

   Tuple unpacking = Assign values [OK]

Hint: Match variables to tuple elements in order [OK]

Common Mistakes:

• Thinking it creates a tuple instead of unpacking
• Confusing unpacking with swapping
• Expecting an error from correct syntax

2. Which of the following is the correct syntax for tuple unpacking in Python?

easy

A. a, b = [1, 2

B. a, b = (1, 2)

C. (a, b = 1, 2

D. a = (1, 2) = b

Solution

1. Step 1: Check each option for valid unpacking syntax

   a, b = [1, 2 "a, b = [1, 2" is missing closing bracket, syntax error. (a, b = 1, 2 "(a, b = 1, 2" has mismatched parentheses, syntax error. a = (1, 2) = b "a = (1, 2) = b" is invalid syntax. Only B is correct.

2. Step 2: Identify the best tuple unpacking syntax

   a, b = (1, 2) clearly shows tuple unpacking with a tuple on the right and variables on the left, which is the most correct and clear syntax.

3. Final Answer:

   a, b = (1, 2) -> Option B

4. Quick Check:

   Tuple unpacking syntax = a, b = (1, 2) [OK]

Hint: Look for variables on left, tuple on right [OK]

Common Mistakes:

• Forgetting closing bracket when using lists
• Mismatched parentheses on left side
• Using invalid assignment chaining

3. What is the output of this code?

point = (4, 5)
x, y = point
print(x + y)

medium

A. 9

B. (4, 5)

C. 45

D. Error

Solution

1. Step 1: Unpack the tuple into variables

   The tuple (4, 5) is unpacked into x = 4 and y = 5.

2. Step 2: Calculate the sum of x and y

   Adding x + y gives 4 + 5 = 9.

3. Final Answer:

   9 -> Option A

4. Quick Check:

   4 + 5 = 9 [OK]

Hint: Add unpacked variables directly [OK]

Common Mistakes:

• Printing the tuple instead of sum
• Concatenating numbers as strings
• Expecting a syntax error

4. Find the error in this tuple unpacking code:

data = (1, 2, 3)
a, b = data
print(a, b)

medium

A. Too many values to unpack

B. Not enough values to unpack

C. Syntax error in assignment

D. No error, code runs fine

Solution

1. Step 1: Count values and variables

   The tuple data has 3 values but only 2 variables a and b are on the left side.

2. Step 2: Understand unpacking rules

   Python requires the number of variables to match the number of values unless using a starred expression. Here, 3 values cannot fit into 2 variables, causing a ValueError.

3. Final Answer:

   Too many values to unpack -> Option A

4. Quick Check:

   Mismatch in values and variables = Error [OK]

Hint: Count variables and values before unpacking [OK]

Common Mistakes:

• Ignoring value-variable count mismatch
• Expecting Python to auto-fill missing variables
• Using wrong error type

5. Given a list of tuples representing points, how do you unpack and sum all x and y values?

points = [(1, 2), (3, 4), (5, 6)]
total_x = 0
total_y = 0
for point in points:
    # Fill in unpacking here
    total_x += x
    total_y += y
print(total_x, total_y)

Which line correctly unpacks the tuple inside the loop?

hard

A. (x, y) = [point]

B. point = x, y

C. x, y = point

D. x, y = [point]

Solution

1. Step 1: Understand the loop variable

   Each point is a tuple like (1, 2). To access x and y, unpack it into variables x and y.

2. Step 2: Choose correct unpacking syntax

   The correct syntax is x, y = point. This assigns the first element to x and second to y for each tuple in the list.

3. Final Answer:

   x, y = point -> Option C

4. Quick Check:

   Unpack tuple with x, y = point [OK]

Hint: Unpack tuple directly with x, y = point [OK]

Common Mistakes:

• Assigning tuple to variables in wrong order
• Using list brackets incorrectly
• Trying to unpack list instead of tuple