PCEP Data Types, Variables, Basic I/O and Operators Practice Test 2 — 15 Questions

Question 1

Which of the following is a valid Python variable name?

Accepted Answer

_data2. (_data2) is correct because Python variable names must start with a letter or an underscore, and can contain letters, digits, and underscores. _data2 begins with an underscore followed by valid characters, making it a legal identifier.

Answer

my-var

Answer

for

Answer

2nd_value

Question 2

Which TWO of the following are valid Python variable names?

Accepted Answer

var2. Option C, var2, is a valid Python identifier because it starts with a letter and contains only letters and digits, with no spaces or special characters. Option D, _var, is also valid because Python identifiers may begin with an underscore, which is commonly used for internal or private variables. Option A, var name, is invalid because it contains a space, which is not allowed in identifiers. Option B, 1var, is invalid because identifiers cannot begin with a digit. Option E, my-var, is invalid because the hyphen is not a legal character in Python variable names; only letters, digits, and underscores are permitted.

Answer

var name

Answer

1var

Answer

my-var

Question 3

Which THREE of the following are arithmetic operators in Python?

Accepted Answer

//. Option A, //, is correct because it is Python's floor division operator, which divides two numbers and rounds the result down to the nearest integer (e.g., 7 // 2 yields 3). Option D, +, is correct because it is the addition operator for numeric operands (and also concatenation for sequences), making it a core arithmetic operator. Option E, **, is correct because it is the exponentiation operator, raising the left operand to the power of the right operand (e.g., 2 ** 3 yields 8). Option B, @, is not an arithmetic operator; it is the matrix multiplication operator introduced in PEP 465 for use with types like numpy arrays. Option C, &, is not arithmetic either; it is the bitwise AND operator, which operates on the individual bits of integers rather than performing arithmetic.

Answer

@

Answer

&

Question 4

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 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 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 7

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

Question 8

Refer to the exhibit. What will happen when this code is executed?

Accepted Answer

Raises ValueError. The code attempts to convert the string '10.5' to an integer using int(). Since '10.5' contains a decimal point, it is not a valid integer literal; int() cannot parse it and raises a ValueError. The correct approach would be to first convert to float (float('10.5')) and then to int if needed.

Answer

Prints 10.5

Answer

Prints 10

Answer

Raises TypeError

Question 9

A function is designed to return False if a number is not divisible by 2. Which of the following return statements correctly implements this logic?

Accepted Answer

return n % 2 == 0. The function must return False when the number is not divisible by 2. The expression `n % 2 == 0` evaluates to True when n is even (divisible by 2) and False when n is odd (not divisible by 2), directly matching the required logic.

Answer

return n % 2 != 0

Answer

return n % 2 == 1

Answer

return not n % 2 == 0

Question 10

What is the output when the user enters 25?

Accepted Answer

2525. When the user enters 25, the input() function returns the string "25". The print() function then concatenates the string "25" with itself using the + operator, resulting in "2525". This is because the + operator performs string concatenation when both operands are strings, not numeric addition.

Answer

Error

Answer

25

Answer

50

Question 11

Which TWO of the following are valid Python variable names?

Accepted Answer

_name. Option A, _name, is a valid Python identifier because it begins with an underscore, which is an allowed leading character, and contains only letters and underscores. Option E, name_2, is also valid because it starts with a letter and consists solely of letters, digits, and underscores, with no reserved keyword conflict. Option B, 2name, is invalid because Python identifiers cannot begin with a digit. Option C, name$, is invalid because the dollar sign is not a permitted character in Python identifiers. Option D, name-2, is invalid because the hyphen is not allowed in Python identifiers (it would be parsed as subtraction).

Answer

2name

Answer

name$

Answer

name-2

Question 12

Which THREE of the following expressions evaluate to True?

Accepted Answer

10 / 2 == 5.0. Option A is correct because in Python the true division operator / always returns a float, so 10 / 2 yields 5.0, and 5.0 == 5.0 is True. Option B is correct because the floor division operator // returns the integer quotient when both operands are integers, so 10 // 2 yields 5, and 5 == 5 is True. Option C is correct because the modulo operator % returns the remainder of the division, and 10 divided by 2 has remainder 0, so 10 % 2 == 0 is True. Option D is incorrect because 10 // 2 evaluates to 5, not 5.1, so 5 == 5.1 is False. Option E is incorrect because 10 % 2 evaluates to 0, not 1, so 0 == 1 is False.

Answer

10 // 2 == 5.1

Answer

10 % 2 == 1

Question 13

A company needs to process user input that must be a whole number between 1 and 100. Which code snippet correctly validates and converts the input?

Accepted Answer

num = input("Enter: "); if num.isdigit() and 1 <= int(num) <= 100: .... It first checks that the input string consists only of digits using `isdigit()`, which prevents `ValueError` from non-numeric input, and then safely converts to `int` only after validation. This ensures the input is a whole number between 1 and 100 before any further processing.

Answer

num = int(input("Enter: ")); if 1 <= num <= 100: ...

Answer

num = int(input("Enter: ")); if num in range(1,101): ...

Answer

All of the above are correct.

Question 14

What is the most appropriate fix for the error shown in the exhibit?

Accepted Answer

Use str(42) to convert the integer to a string.. The error is a TypeError caused by attempting to concatenate a string with an integer using the + operator. The most direct fix is to convert the integer to a string with str(), as shown in option D. While option B (using comma syntax) also resolves the error because print() can accept multiple arguments, the question asks for the 'most appropriate' fix, which typically refers to the explicit type conversion. Option A is incorrect because it claims that option C is a valid fix, which it is not (int() cannot convert a non-numeric string). Option C is invalid. Therefore, option D is the correct answer.

Answer

Either A or C are valid fixes.

Answer

Use the comma syntax: print("The answer is", 42).

Answer

Use int("The answer is ") to convert the string to an integer.