PCAP Practice Test 10 — 10 Questions

Question 1

A developer defines a class 'MathUtils' with a method that performs a calculation either on the class or on instances. Which method type should be used for a method that does not depend on instance state but can be called on the class?

Accepted Answer

@classmethod
def add(cls, a, b): return a + b. Option B correctly uses @classmethod, which receives the class as first argument and can be called on the class or instance. Option A uses @staticmethod, which does not receive cls. Option C is a regular instance method requiring self. Option D uses @property, which is for attribute-like access.

Answer

def add(self, a, b): return a + b

Answer

@property
def add(self): return lambda a,b: a+b

Answer

@staticmethod
def add(a, b): return a + b

Question 2

A class has a method that does not access any instance or class data. What decorator should be used to define it as a utility method that can be called on the class itself without requiring an instance?

Accepted Answer

@staticmethod. The @staticmethod decorator is used for methods that do not depend on the class or instance state. They can be called on both instances and the class.

Answer

@property

Answer

@abstractmethod

Answer

@classmethod

Question 3

Which THREE of the following escape sequences are valid in a Python string and represent a single character? (Select exactly three.)

Accepted Answer

\'. Option B (\'), Option C (\), and Option E (
) are valid escape sequences. Option A (\q) is not a standard escape sequence. Option D (\x) is invalid without two hex digits; \x1F is valid.

Answer

\x

Answer

\q

Question 4

What will the above code output?

Accepted Answer

Index out of range. Option B is correct because accessing index 100 on a string of length 11 raises an IndexError, which is caught and the message is printed. Option A would happen if the error were not caught. Option C is not thrown. Option D is false because the error is caught and the except block runs.

Answer

The program runs without output.

Answer

The program crashes with an unhandled IndexError.

Answer

ValueError is raised.

Question 5

Which method returns the lowest index where a specified substring is found, or -1 if not found?

Accepted Answer

find(). Option A (find) returns -1 if not found. Option B (index) raises ValueError. Option C (search) is from re module. Option D (locate) is not a Python method.

Answer

locate()

Answer

search()

Answer

index()

Question 6

Refer to the exhibit. A Python script uses re.split with a regex pattern. What is the output?

Accepted Answer

['one', 'two', 'three']. The pattern \s+ matches one or more whitespace characters, so the string is split at the three spaces, resulting in a list of three items.

Answer

['one   two three']

Answer

['one', 'two', 'three', '']

Answer

['one', ' ', 'two', ' ', 'three']

Question 7

Which TWO string methods are used to determine if a string begins or ends with a specified prefix or suffix? (Choose two.)

Accepted Answer

startswith(). startswith() checks if a string starts with a given prefix, and endswith() checks if it ends with a given suffix. Both return Boolean values.

Answer

count()

Answer

find()

Answer

index()

Question 8

Which THREE of the following are immutable types in Python?

Accepted Answer

str. str, bytes, and tuple are immutable. list and bytearray are mutable.

Answer

bytearray

Answer

list

Question 9

Given `s = 'Python'`, what is the result of `s[-4::-1]`?

Accepted Answer

'tyP'. Option C is correct: `s[-4::-1]` starts at index -4 (which is 't' in 'Python' since indices: P=0, y=1, t=2, h=3, o=4, n=5; negative: n=-1, o=-2, h=-3, t=-4, y=-5, P=-6), and steps backwards by -1 to the beginning, so it takes characters at indices -4, -5, -6 which are 't', 'y', 'P' -> 'tyP'. Option A is wrong because it slices from -4 to end. Option B is the reverse of the whole string. Option D is slicing from -4 to 0 with step -1 (exclusive of 0? Actually -4:-1:1 gives 'tho'? Let's not confuse).

Answer

'ty'

Answer

'tho'

Answer

'nohtyP'

Question 10

A developer writes code to display a floating-point number with exactly two decimal places. Which f-string expression is correct for value = 3.14159?

Accepted Answer

f"{value:.2f}". The format specifier .2f indicates two digits after the decimal point. f"{value:.2f}" yields '3.14'.

Answer

f"{value:0.2}"

Answer

f"{value:%2f}"

Answer

f"{value:2f}"