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

Question 1

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"]. Option A is correct because 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 2

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

Accepted Answer

5 / 2. Option D is correct because 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 3

Which of the following is a valid Python variable name?

Accepted Answer

_var. Option D (_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 4

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 5

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

Accepted Answer

3.14. Option C is correct because `3.14` is a literal decimal number with a fractional part, which Python interprets as a floating-point value. Floating-point literals in Python can be written in decimal notation with a dot, or in scientific notation (e.g., `1e3`), but `3.14` is the only option here that is both a numeric literal and explicitly a float.

Answer

1e3

Answer

'3.14'

Answer

0xFF

Question 6

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 7

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'). Option B is correct because 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 8

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 9

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

Accepted Answer

x //= 0. Option C is correct because 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 10

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

Accepted Answer

if val is not None:. Option C is correct because 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 11

Which of the following expressions will evaluate to True?

Accepted Answer

3 == 3.0. Option A is correct because 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 12

Which TWO of the following are Python membership operators?

Accepted Answer

not in. Option B is correct because '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 13

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

Accepted Answer

str. Option A is correct because 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

Question 14

Which TWO of the following expressions will evaluate to True?

Accepted Answer

3 == 3.0. Option D is correct because in Python, the '==' operator compares values, and since integers and floats are compared by numeric value, 3 and 3.0 are numerically equal, so the expression evaluates to True. Option E is correct because 'is' checks object identity, and small integers like 3 are interned by Python, meaning they refer to the same object in memory, so '3 is 3' returns True.

Answer

3 is not 3

Answer

3 > 2 and 2 > 3

Answer

3 != 3.0

Question 15

Refer to the exhibit. If the user enters 5 and 3, what is the output?

Accepted Answer

53. In Python, the `input()` function always returns a string. When the user enters 5 and 3, the `+` operator concatenates the two strings '5' and '3', producing the string '53'. Option D is correct because no numeric conversion is performed.

Answer

8

Answer

5 3

Answer

TypeError

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

Exhibit

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

Exhibit