PCEP Computer Programming and Python Fundamentals Practice Test 7 — 15 Questions

Question 1

Refer to the exhibit. Which of the following is true about the output?

Accepted Answer

Prints "Error: invalid literal for int() with base 10: 'abc'" then "Done". int("abc") raises ValueError, which is caught, prints the error message from the exception, then the finally block executes. Option A is correct.

Answer

Prints "Error:" then "Done" without the message

Answer

Raises an unhandled exception

Answer

Prints only "Done"

Question 2

Which two of the following are valid Python variable names? (Choose two.)

Accepted Answer

value_2. Variable names cannot start with a digit, cannot contain hyphens, and cannot be reserved keywords. _value and value_2 are valid.

Answer

value-2

Answer

2nd_value

Answer

for

Question 3

Which two of the following are correct ways to create a dictionary in Python? (Choose two.)

Accepted Answer

my_dict = dict(a=1, b=2). A dictionary can be created with {} literal or with dict() constructor using keyword arguments. Options A and B are correct.

Answer

my_dict = {a:1, b:2}

Answer

my_dict = dict(['a',1],['b',2])

Answer

my_dict = ["a":1, "b":2]

Question 4

Which three of the following are true about Python lists? (Choose three.)

Accepted Answer

Lists can contain elements of different data types.. Lists are mutable, can hold mixed data types, support slicing, and len() returns the number of elements. They cannot be used as dictionary keys because they are unhashable.

Answer

Lists are indexed starting from 1.

Answer

Lists are immutable.

Question 5

A junior developer writes a Python script to calculate the average of three numbers: avg = a + b + c / 3. What is the problem with this code?

Accepted Answer

Missing parentheses cause incorrect order of operations. Due to operator precedence, division occurs before addition, so the formula computes a + b + (c/3) instead of (a+b+c)/3.

Answer

Division by a variable is not allowed

Answer

Python cannot divide integers

Answer

Variable names are too short

Question 6

A developer writes a function that modifies a global variable inside the function:

count = 0
def increment():
    count += 1

When called, an error occurs. What is the correct way to fix this?

Accepted Answer

Use 'global count' inside the function. To modify a global variable inside a function, the global keyword must be used to declare the variable as global.

Answer

Define count inside the function

Answer

Use the 'static' keyword

Answer

Pass count as an argument to the function

Question 7

A company is developing a data processing pipeline that must handle large datasets efficiently. They notice that using a list comprehension to filter data is slower than expected. Which alternative approach would likely improve performance?

Accepted Answer

Using a generator expression. Generator expressions are memory efficient and can be faster for large datasets because they produce items lazily without building the entire list.

Answer

Using the map() function

Answer

Using a for loop with append

Answer

Using a lambda function

Question 8

A developer wants to create a list of even numbers from 0 to 10 inclusive. Which code snippet will correctly produce [0, 2, 4, 6, 8, 10]?

Accepted Answer

All of the above. All three options produce the same list: Option A uses multiplication, option B filters, option C uses step. So all are correct.

Answer

list(range(0,11,2))

Answer

[x for x in range(11) if x%2==0]

Answer

[x*2 for x in range(6)]

Question 9

A beginner writes: x = 10; y = 3; print(x // y). What is the output?

Accepted Answer

3. The // operator performs floor division, returning the integer quotient. 10 // 3 equals 3.

Answer

1

Answer

3.0

Answer

3.333

Question 10

A developer is writing a script to process user input. The script should repeatedly ask for a number until a valid integer is entered. Which loop structure is most appropriate?

Accepted Answer

while loop with a condition. A while loop with a condition that checks if the input is valid is the standard approach for input validation.

Answer

for loop

Answer

do-while loop

Answer

Recursion

Question 11

A developer writes: print('Hello' + 5). What is the result?

Accepted Answer

TypeError. Python does not allow concatenation of string and integer; it raises a TypeError.

Answer

Hello 5

Answer

SyntaxError

Answer

Hello5

Question 12

A company has a Python script that imports a module from a package. The package structure is: mypackage/__init__.py, mypackage/module.py. The script uses 'from mypackage import module'. Which file must exist for this import to work?

Accepted Answer

mypackage/__init__.py. For a directory to be treated as a package, it must contain an __init__.py file (though optional in Python 3.3+ for namespace packages, it is required for regular packages).

Answer

mypackage.py

Answer

module.py in the current directory

Answer

Only mypackage/module.py is needed

Question 13

A script uses 'import math' then calls 'math.sqrt(-1)'. What is the outcome?

Accepted Answer

ValueError. The math.sqrt function expects a non-negative number; passing -1 raises a ValueError indicating a math domain error.

Answer

NaN

Answer

A complex number

Answer

AttributeError

Question 14

Refer to the exhibit. What is the output when the following code is executed: print(calculate_discount(100, 0.6))

Accepted Answer

Discount too high followed by 100. The discount 0.6 > 0.5, so it prints 'Discount too high' and returns price (100), then the print outputs 100.

Answer

Discount too high

Answer

40.0

Answer

100

Question 15

Refer to the exhibit. What is the output?

Accepted Answer

Invalid integer. int("hello") raises ValueError, which is caught by the first except block, printing 'Invalid integer'.

Answer

Invalid integer
Some error

Answer

No output

Answer

Some error

PCEP Computer Programming and Python Fundamentals Practice Test 7 — 15 Questions

Exhibit

PCEP Computer Programming and Python Fundamentals Practice Test 7 — 15 Questions

Exhibit