Boolean values (True and False) in Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of Boolean expressions with logical operators

What is the output of this Python code snippet?

Python

a = True
b = False
print(a and not b)

A True

B SyntaxError

C None

D False

💡 Hint

Remember that 'not' reverses the Boolean value.

Variable 'a' is True, 'b' is False, so 'not b' is True. 'True and True' results in True.

❓ Predict Output

intermediate

Boolean conversion of different values

What will be the output of this code?

Python

print(bool(0), bool(1), bool([]), bool([0]))

A False False True True

B False True False True

C True False True False

D True True False False

💡 Hint

Zero and empty containers are False; non-empty containers and non-zero numbers are True.

0 and empty list [] are False; 1 and list with one element [0] are True.

❓ Predict Output

advanced

Boolean evaluation in conditional expressions

What is the output of this code?

Python

x = 5
result = 'Yes' if x > 3 and x < 10 else 'No'
print(result)

A Yes

B No

C False

D True

💡 Hint

Check if x is between 3 and 10.

x is 5, which is greater than 3 and less than 10, so the condition is True and 'Yes' is printed.

❓ Predict Output

advanced

Boolean logic with mixed operators

What will this code print?

Python

a = False
b = True
c = False
print(a or b and c)

A SyntaxError

B True

C None

D False

💡 Hint

Remember operator precedence: 'and' before 'or'.

'b and c' is 'True and False' which is False; then 'a or False' is 'False or False' which is False.

🧠 Conceptual

expert

Understanding Boolean identity and equality

Which statement about Python Boolean values is correct?

A True equals 1 and is identical to 1

B True is 1 and False is 0

C True == 1 and False == 0 but True is not 1 and False is not 0

D False equals 0 but is identical to None

💡 Hint

Check the difference between '==' and 'is' in Python.

'==' checks value equality, so True == 1 is True; 'is' checks identity, so True is 1 is False because they are different objects.

Practice

1. Which of the following is a Boolean value in Python?

easy

A. yes

B. "True"

C. True

D. 1

Solution

1. Step 1: Understand Boolean values

   Boolean values in Python are exactly True or False, not strings or numbers.

2. Step 2: Identify the correct Boolean

   True is the Boolean value True. "yes", "True", and 1 are not Boolean types.

3. Final Answer:

   True -> Option C

4. Quick Check:

   Boolean = True or False [OK]

Hint: Look for exact True or False without quotes [OK]

Common Mistakes:

• Confusing string "True" with Boolean True
• Using numbers like 1 as Boolean
• Thinking any word means Boolean

2. Which of these is the correct way to write a Boolean value in Python?

easy

A. False

B. true

C. FALSE

D. false

Solution

1. Step 1: Recall Python Boolean syntax

   Python Boolean values start with a capital letter: True and False.

2. Step 2: Check each option

   Only False, False, is correctly capitalized. Others are lowercase or all caps, which are invalid.

3. Final Answer:

   False -> Option A

4. Quick Check:

   Booleans start with uppercase [OK]

Hint: Booleans start with uppercase T or F [OK]

Common Mistakes:

• Writing booleans in lowercase
• Using all uppercase letters
• Confusing with strings

3. What will be the output of this code?

print(5 > 3)

medium

A. Error

B. False

C. 5 > 3

D. True

Solution

1. Step 1: Evaluate the comparison

   The expression 5 > 3 checks if 5 is greater than 3, which is true.

2. Step 2: Understand print output

   Printing a Boolean expression prints True or False accordingly. Here it prints True.

3. Final Answer:

   True -> Option D

4. Quick Check:

   5 > 3 is True [OK]

Hint: Compare values; print shows True or False [OK]

Common Mistakes:

• Thinking it prints the expression as text
• Confusing True with string 'True'
• Expecting an error from comparison

4. Find the error in this code:

if True = 5:
    print("Yes")

medium

A. Assignment used instead of comparison

B. Missing colon after if

C. True cannot be used in conditions

D. Indentation error

Solution

1. Step 1: Check the if statement syntax

   The code uses = which is assignment, not comparison. Conditions need ==.

2. Step 2: Identify the error type

   Using = in an if condition causes a syntax error because assignment is not allowed there.

3. Final Answer:

   Assignment used instead of comparison -> Option A

4. Quick Check:

   Use == for comparison, not = [OK]

Hint: Use == to compare, = is for assigning [OK]

Common Mistakes:

• Using = instead of ==
• Forgetting colon after if
• Thinking True can't be in conditions

5. You want to check if a number n is NOT zero using Boolean logic. Which code correctly prints True if n is not zero, otherwise False?

hard

A. print(n == 0)

B. print(n != 0)

C. print(n = 0)

D. print(not n)

Solution

1. Step 1: Understand the condition

   We want to print True if n is NOT zero, so the condition should check n != 0.

2. Step 2: Evaluate each option

   print(n == 0) prints True if n is zero (wrong). print(n != 0) correctly prints True if n is not zero. print(n = 0) causes a syntax error (invalid syntax). print(not n) prints True if n is zero (because not 0 is True), so it's opposite.

3. Final Answer:

   print(n != 0) -> Option B

4. Quick Check:

   Use != to check not equal [OK]

Hint: Use != to check not equal, not = [OK]

Common Mistakes:

• Using = instead of !=
• Confusing not n with n != 0
• Using == instead of !=