PCEP Practice Test 4 — 25 Questions

Question 1

What is the result of the following expression? 3 + 4 * 2 ** 3 // 5

Accepted Answer

9. The expression follows Python's operator precedence: exponentiation (`**`) has the highest precedence, then multiplication (`*`) and floor division (`//`) are evaluated left to right, and finally addition (`+`). First, `2 ** 3` computes to 8. Then `4 * 8` gives 32, and `32 // 5` yields 6 (floor division truncates toward negative infinity, but here it's positive). Finally, `3 + 6` equals 9. Thus, option A is correct.

Answer

7

Answer

6

Answer

11

Question 2

Which two of the following are valid Python variable names? (Choose two.)

Accepted Answer

value_2. `value_2` starts with a letter and contains only letters, digits, and underscores, which satisfies Python's identifier rules. Python variable names must begin with a letter or underscore, and can include letters, digits, and underscores; `value_2` meets all these criteria.

Answer

for

Answer

2nd_value

Answer

val-ue

Question 3

A developer runs the command and sees the output. Which statement about the data type is correct?

Accepted Answer

3.14 is a float in Python.. In Python, numeric literals with a decimal point, such as 3.14, are always interpreted as the built-in float type. Python does not have a separate 'double' type; its float is implemented as a C double (64-bit IEEE 754), but the language itself refers to it as float. This is a fundamental rule of Python's data type system.

Answer

3.14 is a decimal.Decimal type.

Answer

3.14 is a float, but Python also treats it as a double.

Answer

3.14 is a string.

Question 4

A developer needs to iterate over a list of network interfaces and print only the names that start with 'eth'. Which code should be used?

Accepted Answer

for iface in interfaces: if iface.startswith('eth'): print(iface). The `startswith()` string method is the most direct and readable way to check if each interface name begins with the substring 'eth'. This approach avoids unnecessary slicing or substring membership checks, making the intent clear and the code efficient.

Answer

for i in range(len(interfaces)): if 'eth' in interfaces[i]: print(interfaces[i])

Answer

for iface in interfaces: if iface[:3] is 'eth': print(iface)

Answer

for iface in interfaces: if 'eth' in iface: print(iface)

Question 5

What is the result of 'bool(0) and bool(1)'?

Accepted Answer

False. The expression `bool(0) and bool(1)` evaluates to `False` because `bool(0)` converts the integer 0 to `False` (since 0 is falsy in Python), and `bool(1)` converts 1 to `True`. The `and` operator returns `True` only if both operands are truthy; here, `False and True` yields `False`.

Answer

True

Answer

1

Answer

0

Question 6

A script uses the input() function to get a user's age: age = input('Enter age: '). Later it computes age > 18. This raises a TypeError. What is the root cause?

Accepted Answer

The variable age is a string, not an integer.. The `input()` function in Python always returns a string, regardless of what the user types. When the user enters their age, the variable `age` holds a string like '25', not an integer. Comparing a string to an integer with the `>` operator raises a `TypeError` because Python does not automatically convert strings to numbers for comparison.

Answer

The input() function cannot read numbers.

Answer

The variable age is automatically converted to int.

Answer

The comparison operator > is not valid for strings.

Question 7

Which THREE statements about the break statement in Python are correct? (Choose three.)

Accepted Answer

It exits the innermost loop when executed.. The break statement, when executed inside a loop, immediately terminates the innermost loop it resides in, transferring control to the next statement after the loop. This is a fundamental behavior defined in Python's control flow documentation.

Answer

It can be used with an optional else clause.

Answer

It can be used in an if statement outside any loop.

Question 8

Which THREE of the following are Python built-in data types?

Accepted Answer

bool. `bool` is a built-in data type in Python, used to represent Boolean values `True` and `False`. It is a subclass of `int` and is fundamental for logical operations and conditional expressions.

Answer

array

Answer

char

Question 9

Match each Python keyword to its use.

Accepted Answer

break: Exits the innermost loop. The correct matches are: break is used to exit a loop prematurely; continue skips the current iteration; pass is a no-operation statement. Common mistakes include swapping the definitions of break and continue.

Answer

break: Skips the rest of the current iteration

Answer

continue: Exits the innermost loop

Question 10

Match each Python operator to its description.

Accepted Answer

+: Addition. These are common operators in Python for arithmetic and comparison. The correct matches are: + for addition, * for multiplication, // for floor division, % for modulus.

Answer

+: Multiplication

Answer

//: Modulus

Question 11

Match each exception type to its description.

Accepted Answer

ValueError: Raised when a function gets an argument with correct type but inappropriate value. These are built-in exceptions in Python that indicate specific error conditions.

Answer

ValueError: Raised when an operation or function is applied to an object of inappropriate type

Answer

IndexError: Raised when a dictionary key is not found

Question 12

Which TWO of the following code snippets will produce the output '0 1 2'? (Choose two.)

Accepted Answer

for i in range(5): if i>2: break; print(i). The loop iterates over range(5) (0,1,2,3,4), but the break statement executes when i > 2, so the loop terminates after printing 0, 1, and 2. Option D is correct because range(3) generates exactly the sequence 0, 1, 2, and each value is printed in order.

Answer

for i in range(5): if i%2==0: print(i); else: continue

Answer

i=0; while i<3: print(i); i+=1; else: print('done')

Answer

i=0; while i<3: print(i)

Question 13

Which of the following variable names is valid in Python?

Accepted Answer

_count. (_count) is valid because Python allows identifiers to start with an underscore, and it contains only letters and underscores. Python variable names must start with a letter or underscore, followed by letters, digits, or underscores, and cannot be a reserved keyword.

Answer

1st_value

Answer

my-var

Answer

class

Question 14

What does 'print(2 ** 3)' output?

Accepted Answer

8. The ** operator in Python performs exponentiation, raising the left operand (2) to the power of the right operand (3), which equals 8. The print() function then outputs this integer result to the console.

Answer

9

Answer

23

Answer

6

Question 15

What is the output of the following code?
```python
print('Hello', 'World', sep='-')
```

Accepted Answer

Hello-World. The `print()` function's `sep` parameter specifies the separator between multiple arguments. By default, `sep` is a space, but here it is explicitly set to `'-'`, so the output joins 'Hello' and 'World' with a hyphen, producing 'Hello-World'. Option D is correct because the hyphen is placed directly between the two strings without any extra spaces.

Answer

HelloWorld

Answer

Hello - World

Answer

Hello World

Question 16

A developer runs the following code: x = 0.1; y = 0.2; print(x + y == 0.3). What is the output and why?

Accepted Answer

False, due to floating-point precision. Floating-point numbers in Python (and most programming languages) are stored in binary (IEEE 754 double-precision), and values like 0.1 and 0.2 cannot be represented exactly. The sum 0.1 + 0.2 yields a result slightly greater than 0.3 (approximately 0.30000000000000004), so the equality comparison returns False.

Answer

False, because the + operator is not defined for floats

Answer

True, because Python rounds to 0.3

Answer

True, because Python uses decimal arithmetic

Question 17

Refer to the exhibit. The code used is: name = input('Enter name: '); print('Hello', name). What will be printed if the user enters 'Alice'?

Accepted Answer

Hello Alice. The `input()` function captures the user's typed input as a string, and the `print()` function outputs the string 'Hello ' followed by the value of the `name` variable. When the user enters 'Alice', `name` becomes 'Alice', so the output is 'Hello Alice'.

Answer

Hello Bob

Answer

Error

Answer

Hello name

Question 18

A developer needs to swap the values of two variables a and b in a single line of code. Which statement correctly accomplishes this?

Accepted Answer

a, b = b, a. Python supports tuple unpacking, allowing the values of variables `a` and `b` to be swapped in a single line: `a, b = b, a`. The right-hand side `b, a` creates a tuple of the current values, which is then unpacked and assigned to the left-hand side variables, effectively swapping them without needing a temporary variable.

Answer

a = b, b = a

Answer

a = b; b = a

Answer

a = b; a = b

Question 19

Which data type is most appropriate to store a user's age in a Python program?

Accepted Answer

int. A user's age is a whole number without a fractional component, so the integer type (int) is the most appropriate choice. Python's int can represent any integer value, including ages like 25 or 0, without the overhead or precision issues of floating-point numbers.

Answer

float

Answer

bool

Answer

str

Question 20

A program prints a greeting: name = input("Enter name: "); print("Hello, " + name + "!"). If user enters "Alice", what is output?

Accepted Answer

Hello, Alice!. The `print` function concatenates the string literals and the variable `name` using the `+` operator exactly as specified. When the user enters "Alice", the expression `"Hello, " + name + "!"` becomes `"Hello, Alice!"` — the space after the comma is part of the first string literal, and the exclamation mark is part of the last string literal, producing the output exactly as shown in option A.

Answer

Hello,Alice !

Answer

Hello,Alice!

Answer

Hello, Alice !