PCEP Practice Test 22 — 15 Questions

Question 1

What is the output from the interactive Python session?

Accepted Answer

3 1. The expression `10 // 3` performs integer (floor) division, which discards the fractional part and returns the integer quotient 3. The expression `10 % 3` returns the remainder of the division, which is 1. Therefore, the output is `3 1`, making option B correct.

Answer

3.333 1

Answer

1 3

Answer

3 0

Question 2

Which THREE of the following are built-in exceptions in Python? (Select three.)

Accepted Answer

StopIteration. StopIteration is a built-in exception in Python that is raised to signal the end of an iterator. It is automatically raised by the __next__() method when there are no further items to iterate over, and is caught by for loops internally to terminate iteration.

Answer

LoopError

Answer

DivisionError

Question 3

A program evaluates the expression: (True or False) and not (True and False). What is the result?

Accepted Answer

True. The expression `(True or False) and not (True and False)` evaluates step by step: `True or False` is `True`, `True and False` is `False`, `not False` is `True`, and finally `True and True` is `True`. In Python, boolean operators `or`, `and`, and `not` follow standard precedence (`not` highest, then `and`, then `or`), and the result is a boolean value.

Answer

Error

Answer

None

Answer

False

Question 4

A programmer has a list of tuples representing (product, price) and wants to find the highest price. Which code correctly finds the maximum price?

Accepted Answer

max_price = max([price for product, price in prices]). Ly uses a list comprehension to extract all prices from the tuples, then passes that list to the built-in `max()` function, which returns the highest numeric value. This directly solves the problem of finding the maximum price without any unnecessary complexity.

Answer

max_price = max(prices, key=lambda x: x[1])

Answer

max_price = 0; for p in prices: if p[1] > max_price: max_price = p[1]

Answer

max_price = sorted(prices, key=lambda x: x[1])[-1]

Question 5

What is the output of 'print(3 * "ab")'?

Accepted Answer

ababab. In Python, the multiplication operator (*) when used with a string and an integer performs string repetition. The expression 3 * "ab" repeats the string "ab" three times, concatenating the copies into a single string "ababab". The print() function then outputs this resulting string to the console.

Answer

ab3

Answer

3ab

Answer

Error

Question 6

A programmer wants to iterate over a list and also access the index. Which built-in function should they use?

Accepted Answer

enumerate(). The `enumerate()` function is the correct choice because it returns an iterator that yields pairs of (index, element) for each item in an iterable, allowing direct access to both the index and the value during iteration without manually managing a counter.

Answer

zip()

Answer

map()

Answer

range()

Question 7

Which function is used to read user input as a string?

Accepted Answer

input(). The `input()` function is the correct answer because it is the built-in Python function specifically designed to read a line of text from the user via standard input (stdin). It always returns the input as a string, regardless of whether the user types digits or other characters, making it the standard tool for console input in Python.

Answer

read()

Answer

scan()

Answer

get()

Question 8

Order the steps to define a class and create an object in Python.

Accepted Answer

Define the class with the `class` keyword and include the `__init__` method, then create an instance by calling the class name, then use the object by calling its methods or accessing attributes.. In Python, to define a class and create an object, you must first write a class definition using the `class` keyword, which typically includes the `__init__` method (the constructor) to initialize attributes. After that, you instantiate the class by calling it like a function, optionally passing arguments to `__init__`. Finally, you use the resulting object by accessing its attributes or calling its methods. Any deviation from this order, such as instantiating before defining the class or omitting the constructor, will lead to errors because the class must exist and be properly defined before any objects can be created.

Answer

Create an instance by calling the class name, then define the class, then use the object.

Answer

Define the class without the `__init__` method, then create an instance, then add the `__init__` method later.

Answer

Define the class, then use the class directly without creating an instance.

Question 9

A program uses 'x = 3.14' and 'y = int(x)'. What is the value of y?

Accepted Answer

3. The int() function in Python truncates the decimal part of a float, converting 3.14 to the integer 3. It does not round to the nearest whole number.

Answer

4

Answer

3.14

Answer

Error

Question 10

Which of the following is a floating-point literal?

Accepted Answer

3.14. `3.14` is a numeric literal with a decimal point, which Python interprets as a floating-point number. Floating-point literals represent real numbers and can be written with a decimal point or using scientific notation (e.g., `3.14e0`).

Answer

'3.14'

Answer

42

Answer

1+2j

Question 11

A junior developer writes the following code to swap two variables: a = 5; b = 10; a = b; b = a. When they print a and b, what is the output?

Accepted Answer

10 10. After `a = b`, both variables hold the value 10. Then `b = a` assigns the current value of `a` (which is now 10) to `b`, so both remain 10. The original value of `a` (5) is lost because it was overwritten before being saved.

Answer

5 5

Answer

5 10

Answer

10 5

Question 12

Which keyword is used to define a function in Python?

Accepted Answer

def. In Python, the `def` keyword is used to define a function, followed by the function name, parentheses, and a colon. This is a fundamental syntax rule in the Python language specification, and no other keyword or identifier is valid for this purpose.

Answer

func

Answer

function

Answer

define

Question 13

A junior developer is writing a script to read a number from input and double it. They write:

num = input("Enter a number: ")
result = num * 2
print(result)

When they test with input 5, the output is '55' instead of 10. What is wrong?

Accepted Answer

The input is treated as a string; they need to convert it to int.. The `input()` function in Python always returns a string, even if the user types a number. When you use the `*` operator on a string, it repeats the string, so `'5' * 2` yields `'55'`. To perform numeric multiplication, you must convert the input to an integer using `int(input(...))`.

Answer

There is a syntax error in the multiplication line.

Answer

The print function is incorrectly formatting the output.

Answer

The variable name 'num' conflicts with a built-in function.

Question 14

A Python script processes a large file and runs out of memory. Which solution is most appropriate?

Accepted Answer

Process the file line by line using a for loop. Reading a file line by line with a for loop in Python processes one line at a time, keeping only the current line in memory. This avoids loading the entire file into RAM, which is the root cause of the memory exhaustion when dealing with large files.

Answer

Increase the memory allocation

Answer

Use a while loop to read chunks

Answer

Read the entire file into memory and split

Question 15

What is the result of 17 % 5 in Python?

Accepted Answer

2. In Python, the % operator performs modulo division, returning the remainder after integer division. 17 divided by 5 equals 3 with a remainder of 2 (since 5 * 3 = 15, and 17 - 15 = 2), so 17 % 5 evaluates to 2.

Answer

4

Answer

3

Answer

1