← Python

Boolean Logic

and, or, not combine boolean values: and requires both True; or requires one True; not flips the value

What it does: 'and' returns True only when both sides are True. 'not' flips the boolean — not False gives True. or returns True if at least ONE side is True. Python booleans are True and False — capital T and F. 5 == 5 is True, then not True is False. Python's boolean operators are lowercase: and, or, not — not AND, OR, NOT. A data type with only two values: True or False.

Common mistakes: Booleans must be capitalized True and False, not true and false. Boolean operators are lowercase and, not AND.

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Learning

Duo

What does True and False return?

FalseTrue

Matches

❌ if x > 0 AND x < 10:

↓

Error: Use lowercase 'and'

Applying

Meanings

Term

Boolean

Meaning

A data type with only two values: True or False.

Practice

print(True and True)

Testing

Gaps

print(True True)

Check Answer

Spots

1x = True

2print(true and false)

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Quick Questions

1. What does True and False return?

A. False ✓

B. True

and returns True only if BOTH sides are True

2. What does True or False return?

A. False

B. True ✓

or returns True if at least ONE side is True

3. What does not True return?

A. False ✓

B. True

not flips the boolean — not True becomes False

4. What does False and False return?

A. True

B. False ✓

and needs both sides to be True — neither side is True here

5. What does False or True return?

A. True ✓

B. False

or returns True when at least one side is True — and True is here

Match the Pairs

if x > 0 AND x < 10: → Error: Use lowercase 'and'

result = true → Error: Use True not true

x > 0 and x < 10 → Valid: Both must be True

not False → Ok: Returns True

print(True or False) → Output: True

print(True and False) → Output: False

Key Term

Boolean

A data type with only two values: True or False.~~and

Fill in the Blanks

1. print(True and True)

2. print(True or False)

3. print(not False)

4. print(5 > 3 and 2 < 10)

5. print(not (10 == 5))

Spot the Error

Question 1

A x = True

B print(true and false)

C print(x)

Line B — Booleans must be capitalized True and False, not true and false

Question 2

A a = True

B print(True AND False)

C b = False

Line B — Boolean operators are lowercase and, not AND

Question 3

A x = True

B print(True & False)

C print(x)

Line B — Use the word 'and', not the & symbol

Question 4

A a = False

B print(True | False)

C print(a)

Line B — Use the word 'or', not the | symbol

Question 5

A x = TRUE

B print(x)

C print(not x)

Line A — Python Booleans use title case True not all caps TRUE

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