← Years 7–8 Creating Digital Solutions

Python and, or, not

Logical operators that combine or flip True/False conditions. and needs both True, or needs at least one True, and not reverses True to False (or False to True).

Part of: 7-8 Digital Technologies: Programming in Python — Module 11

Understanding Python and, or, not in Years 7–8 Creating Digital Solutions

What it does: not flips the value of raining. The code inside the if runs when raining is False. With and, both score > 50 and time < 10 must be True for the if block to run. and needs BOTH sides to be True. 13 > 12 is True and 13 < 15 is True, so the answer is True. score > 50 is False. With and, one False makes the whole condition False. or only needs at least ONE side to be True. is_raining is True, so the result is True. not reverses a Boolean value. not True becomes False. Each side of and must be a full condition. You need to write x again after and.

Common mistakes: Python does not use && for 'and'. Write the word and: ok = age >= 12 and has_pass. Python's logical operators must be lowercase. AND causes an error. It should be: a = True and False.

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Learning

Duo

Which result does this give? age = 13 and True: print(age > 12 and age < 15)

TrueFalse

Matches

if x > 5 or < 10:

↓

Each side of or needs a full condition. It should be: if x > 5 or x < 10:

Applying

Meanings

Term

and, or, not

Meaning

Logical operators that combine or flip True/False conditions. and needs both True, or needs at least one True, and not reverses True to False (or False to True).

Practice

age = 13

Testing

Gaps

if age > 12 age < 20:

Check Answer

Spots

3print("Checking entry")

4ok = age >= 12 && has_pass

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Quick Questions

1. Which result does this give? age = 13 and True: print(age > 12 and age < 15)

A. True ✓

B. False

and needs BOTH sides to be True. 13 > 12 is True and 13 < 15 is True, so the answer is True.

2. score = 40. What does print(score > 50 and score < 100) show?

A. True

B. False ✓

score > 50 is False. With and, one False makes the whole condition False.

3. is_raining = True, has_umbrella = False. What does print(is_raining or has_umbrella) show?

A. True ✓

B. False

or only needs at least ONE side to be True. is_raining is True, so the result is True.

4. Which sentence about or is correct?

A. or is True only when both sides are True

B. or is False only when both sides are False ✓

That describes and, not or. or needs just one True side, so it is False only when both are False.

5. What does print(not True) show?

A. False ✓

B. True

not reverses a Boolean value. not True becomes False.

Match the Pairs

age >= 12 and age <= 15 → True only when BOTH conditions are True, so age must be from 12 to 15

day == "Sat" or day == "Sun" → True when at least ONE condition is True, so it is a weekend day

not reverses a condition: True becomes False and False becomes True → if not raining:

and needs both conditions True before the code inside the if runs → if score > 50 and time < 10:

if x > 5 or < 10: → Each side of or needs a full condition. It should be: if x > 5 or x < 10:

if And(age > 12, age < 15): → and is a lowercase operator placed between two conditions, not a function. It should be: if age > 12 and age < 15:

Key Term

and, or, not

Logical operators that combine or flip True/False conditions. and needs both True, or needs at least one True, and not reverses True to False (or False to True).

Fill in the Blanks

1. if age > 12 and age < 20: print("Teenager")

Hint: Type the logical operator that needs both conditions to be True.

2. if day == "Sat" or day == "Sun": print("Weekend")

Hint: Type the logical operator that needs only one condition to be True.

3. raining = False if not raining: print("Play outside")

Hint: Type the logical operator that reverses False into True.

4. sunny = True warm = False print(sunny or warm)

Hint: Type the operator that gives True when at least one value is True.

5. if score > 50 and not cheated: print("Pass")

Hint: Type the operator that flips the cheated value, so the student must NOT have cheated.

Spot the Error

Question 1

A age = 14

B has_pass = True

C print("Checking entry")

D ok = age >= 12 && has_pass

E print(ok)

Line D — Python does not use && for 'and'. Write the word and: ok = age >= 12 and has_pass.

Question 2

A a = True AND False

B b = True or False

C print(a)

D print(b)

Line A — Python's logical operators must be lowercase. AND causes an error. It should be: a = True and False.

Question 3

A sunny = True

B warm = False

C if sunny warm:

D print("Go outside")

Line C — There is no operator between sunny and warm. Join the conditions with or: if sunny or warm:.

Question 4

A raining = False

B print("Checking weather")

C if !raining:

D print("Leave umbrella")

Line C — Python does not use ! for reversing a condition. Use the word not: if not raining:.

Question 5

A ready = True and

B print(ready)

C print(not ready)

Line A — and needs a True/False value on both sides. The right side is missing. It should be: ready = True and True.

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