class Counter:
    def __init__(self):
        self.count = 0
    def increment(self):
        self.count = self.count + 1
c = Counter()
c.increment()
c.increment()
print(c.count)

What is printed?

Which correctly defines a function that returns the square of n?

def mystery(x):
    y = x * 2
    print(y)

What does mystery(3) return?

def greet(name):
    return "Hello, " + name
result = greet("World")
print(len(result))

What is printed?

items = [10, 20]
items.append(30)
items[0] = 5

What is the value of items?

Which of the following causes an infinite loop?

total = 0
for i in range(0, 4):
    total = total + i
print(total)

What is printed?

x = 4
y = 6
if x * 2 < y or y == 6:
    print("A")
else:
    print("B")

What is printed?

Consider: 

def mean(values): 

    """Return the arithmetic mean of the supplied values.""" 

    total = 0 

    for value in values: 

        total = total + value 

    return total / len(values) 

result = mean([2, 4, 9]) 

print(result) 

State the exact printed output. In your explanation, identify: 

• the value supplied to values;
• the final value of total;
• what len(values) returns.

[2 marks] 

A student wants to calculate: 

result = mean([2, 4, 9]) + 1 

They suggest replacing the function’s final line with: 

print(total / len(values)) 

Explain why printing the mean is not a suitable replacement for returning it in this use of the function. [2 marks]