Module 3 Graded Quiz: Python Programming Fundamentals:Python for Data Science, AI & Development (IBM Data Analyst Professional Certificate) Answers 2025

1. Question 1

What is the output of the code?

• ❌ Go Stop

• ✅ Stop Mike

• ❌ Go Mike

• ❌ Mike

Explanation:
x == "Go" is false, so print('Stop') runs, then print('Mike') — output is Stop then Mike.

2. Question 2

Primary purpose of comparison operators in assignment statements?

• ❌ To convert numeric variables to string representations

• ✅ To evaluate expressions and assign the resulting Boolean values to variables

• ❌ To initialize variables with their default values

• ❌ To perform mathematical operations on both sides of the equation

Explanation:
Comparison operators (==, <, >, etc.) return True/False, which are often assigned to variables for decision logic.

3. Question 3

What determines when a while loop terminates?

• ✅ The evaluation of its conditional expression to False

• ❌ The presence of a print statement within the loop

• ❌ The number of statements inside the loop body

• ❌ While loops always execute exactly five times by default

Explanation:
A while loop runs while its condition is True and stops once that condition becomes False.

4. Question 4

Result of the class example when calling p1.print_point()?

• ❌ y=B

• ❌ x=A

• ❌ x=y=

• ✅ x=A y=B

Explanation:
print('x=', self.x, ' y=', self.y) outputs x= A y= B (commonly represented as x=A y=B).

5. Question 5

Output of the for i, x in enumerate(['A','B','C']): print(i, 2*x) loop?

• ✅ 0 AA 1 BB 2 CC

• ❌ 0 A 1 B 2 C

• ❌ 0 A 2 B 4 C

• ❌ 1 AA 2 BB 3 CC

Explanation:
enumerate yields (index, value). 2 * x duplicates the string: 'A'->'AA', so lines are 0 AA, 1 BB, 2 CC.

6. Question 6

Result after modifying p2.y = 'Denver' and printing?

• ❌ x= Denver y= Boston

• ❌ x= Boston y= Chicago

• ✅ x= Boston y= Denver

• ❌ x= Denver y= Denver

Explanation:
x remains 'Boston'; y was reassigned to 'Denver', so print shows x= Boston y= Denver.

7. Question 7

What does validate_temperature(32) return?

• ❌ “Invalid”

• ✅ “Valid”

• ❌ False

• ❌ None

Explanation:
32 lies between 20 and 40, so the function sets result = "Valid" and returns it.

8. Question 8

What does print(do(1)) produce given the local a = 100 inside do?

• ❌ Product of local variable and parameter

• ❌ Sum of global variable and parameter

• ✅ Sum of local variable and parameter

• ❌ Value of global variable only

Explanation:
Inside do, a is a local variable (100). do(1) returns 1 + 100 = 101 — sum of local a and parameter.

9. Question 9

Most efficient implementation for adding two numbers?

• ❌ Built-in sum with tuple conversion

• ❌ Built-in sum with individual parameters

• ✅ Direct return of parameter summation

• ❌ Intermediate variable assignment before return

Explanation:
The simplest and most efficient is def add(a, b): return a + b — direct return avoids overhead.

10. Question 10

Why use multiple except blocks labeled by error type?

• ❌ Ensure catching the error for program termination

• ✅ To determine the type of error thrown and its location within the program

• ❌ To skip specific sections of code during execution

• ❌ It is not necessary to label errors

Explanation:
Multiple, specific except blocks let you handle different exception types appropriately and make debugging (and correct recovery) easier.

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