PCEP Data Types, Variables, Basic I/O and Operators Practice Test 8 — 15 Questions

Question 1

Which THREE of the following are arithmetic operators in Python?

Accepted Answer

//. The double slash `//` is Python's floor division operator, which performs division and rounds down to the nearest integer. It is one of the standard arithmetic operators in Python, alongside `+`, `-`, `*`, `/`, `%`, and `**`.

Answer

@

Answer

&

Question 2

A developer encounters a TypeError. Which line of code likely caused it?

Accepted Answer

value = input("Enter a number: "). The error in question is a TypeError that occurs when a string is used in an arithmetic operation (e.g., adding a string to an integer). Option D returns a string, so subsequent code expecting a number will fail. Options A, B, and C all return numeric types, so they would not cause that specific error.

Answer

value = eval(input("Enter a number: "))

Answer

value = float(input("Enter a number: "))

Answer

value = int(input("Enter a number: "))

Question 3

A Python program loads this JSON and accesses the first rule's action. Which expression gives the string "permit"?

Accepted Answer

data["rules"][0]["action"]. It uses the correct indexing to access the first element of the 'rules' list (index 0) and then retrieves the value associated with the key 'action' from that dictionary. This yields the string 'permit' as stored in the JSON data.

Answer

data["rules"][0]["action"][:5]

Answer

data["rules"][0]["action"][0]

Answer

data["rules"][1]["action"]

Question 4

Based on the exhibit, which expression returns 2.5 in Python?

Accepted Answer

5 / 2. The division operator `/` in Python always returns a float, even when dividing two integers. Since 5 divided by 2 equals 2.5, the expression `5 / 2` returns the float `2.5`.

Answer

int(5 / 2)

Answer

5 % 2

Answer

5 // 2

Question 5

Which of the following is a valid Python variable name?

Accepted Answer

_var. (_var) is correct because in Python, variable names must start with a letter or an underscore, and can contain letters, digits, and underscores. The underscore is explicitly allowed as the first character, making _var a valid identifier.

Answer

2var

Answer

var name

Answer

var-name

Question 6

Which operator performs integer (floor) division in Python?

Accepted Answer

//. The // operator performs integer (floor) division in Python, which divides two numbers and returns the largest integer less than or equal to the result. For example, 7 // 2 returns 3, not 3.5, because it discards the fractional part and rounds down toward negative infinity for negative numbers.

Answer

%

Answer

/

Answer

**

Question 7

Which of the following is a valid floating-point literal in Python?

Accepted Answer

1e3. Both 1e3 and 3.14 are valid floating-point literals in Python. 1e3 uses scientific notation with an exponent, which Python interprets as a float. 3.14 is a literal with a decimal point. Options B and D are string and integer literals, respectively.

Answer

'3.14'

Answer

0xFF

Question 8

What is the output of the following code?
print(3 * 'ab' + 'c')

Accepted Answer

'abababc'. The expression `3 * 'ab' + 'c'` first multiplies the string `'ab'` by 3, resulting in `'ababab'` (string repetition), and then concatenates `'c'` using the `+` operator, producing `'abababc'`. In Python, the `*` operator on a string and an integer repeats the string that many times, and `+` concatenates strings.

Answer

'ababc'

Answer

TypeError

Answer

'ababab c'

Question 9

A program needs to read a user's age and print a message if they are 18 or older. Which code snippet correctly accomplishes this?

Accepted Answer

age = int(input('Age: '))
if age >= 18:
    print('Adult'). It uses `int()` to convert the user input to an integer, then compares it with the integer `18` using the `>=` operator. This ensures a proper numeric comparison, and if the condition is true, it prints 'Adult'.

Answer

age = int(input('Age: '))
if age >= '18':
    print('Adult')

Answer

age = input('Age: ')
if age >= 18:
    print('Adult')

Answer

age = input('Age: ')
if age == 18:
    print('Adult')

Question 10

What is the data type of the expression (3.14 > 2) and ('a' < 'b')?

Accepted Answer

bool. The expression (3.14 > 2) evaluates to True because 3.14 is greater than 2, and ('a' < 'b') evaluates to True because in Python string comparison uses lexicographic order based on Unicode code points ('a' has code point 97, 'b' has 98). The 'and' operator combines these two Boolean values, resulting in True, which is of type bool. Therefore, the entire expression's data type is bool.

Answer

float

Answer

str

Answer

int

Question 11

Given x = 5, which of the following assignments will cause a runtime error?

Accepted Answer

x //= 0. Division by zero is undefined in Python, and the floor division assignment operator `//=` with a divisor of 0 raises a `ZeroDivisionError` at runtime. The other operators (`**=`, `-=`, `+=`) perform valid arithmetic on the integer 5 and do not cause errors.

Answer

x **= 2

Answer

x -= 3

Answer

x += 2

Question 12

A function sometimes returns None. Which expression correctly checks if the return value is not None?

Accepted Answer

if val is not None:. The `is not` operator is the proper way to check identity inequality in Python. Since `None` is a singleton, comparing with `is not` ensures you are checking whether the value is literally the `None` object, which is the recommended and most readable approach for `None` checks.

Answer

if not val is None:

Answer

if val != None:

Answer

if val:

Question 13

Which of the following expressions will evaluate to True?

Accepted Answer

3 == 3.0. Python's `==` operator performs value equality comparison, and the integer `3` and the float `3.0` represent the same numeric value. Python automatically converts the integer to a float for comparison, so `3 == 3.0` evaluates to `True`.

Answer

2 + 2 * 2 == 8

Answer

10 / 3 == 3

Answer

'a' > 'b'

Question 14

Which TWO of the following are Python membership operators?

Accepted Answer

not in. 'not in' is a Python membership operator that returns True if a value is not found in a sequence (like a list, tuple, or string). Option C is correct because 'in' is the complementary membership operator that returns True if a value is found in a sequence. Both are used to test membership in iterable objects.

Answer

not

Answer

is

Answer

and

Question 15

Which THREE of the following are immutable data types in Python?

Accepted Answer

str. Strings (str) in Python are immutable, meaning once a string object is created, its content cannot be changed. Any operation that appears to modify a string actually creates a new string object in memory, leaving the original unchanged.

Answer

list

Answer

dict