w3resource

PCEP Certification Practice: ValueError Questions & Explanations

PCEP Certification Practice Test - Questions, Answers and Explanations

Below questions focus on ValueError, exploring when it is raised, how it is handled, and the scenarios where it occurs. The set tests the understanding of ValueError in Python and how it fits into the larger Python exception hierarchy.

Question 1: Which of the following best describes the ValueError exception in Python?

  1. Raised when a function is applied to an object of the wrong type.
  2. Raised when an operation or function receives an argument of the correct type but with an inappropriate value.
  3. Raised when a dictionary key is missing.
  4. Raised when trying to access an invalid index in a list.
▼

Answer: B) Raised when an operation or function receives an argument of the correct type but with an inappropriate value.

Explanation: ValueError occurs when a function is given an argument of the correct type but with an inappropriate or invalid value.

Question 2: Which of the following operations can raise a ValueError in Python? (Select all that apply.)

  • Converting a non-numeric string to an integer using int().
  • Accessing an out-of-range index in a list.
  • Passing a negative value to a function that expects a positive number.
  • Trying to delete a key that does not exist in a dictionary.
▼

Answer: A) Converting a non-numeric string to an integer using int().
C) Passing a negative value to a function that expects a positive number.

Explanation: ValueError is raised when a function receives an argument that has the correct type but an inappropriate value, such as converting a non-numeric string to an integer or passing a negative value where only positives are allowed. Accessing an invalid index raises IndexError, and deleting a non-existent key raises KeyError.

Question 3: The _________ exception is raised when a function receives an argument of the correct type but with an invalid value.

  1. IndexError
  2. TypeError
  3. ValueError
▼

Answer: C) ValueError

Explanation: ValueError is raised when a function receives an argument with the correct type but an invalid value, such as passing a string that cannot be converted into an integer.

Question 4: The __________ exception is raised when trying to convert a string that doesn't represent a number into an integer using int().

▼

Answer: ValueError

Explanation: ValueError is raised when attempting to convert an invalid string (like "abc") into an integer using the int() function.

Question 5: Fill in the blank to catch the ValueError when trying to convert a non-numeric string to an integer:

try:
    num = int("xyz")
except __________:
    print("Invalid value for conversion")
▼

Answer: except ValueError:

Explanation: ValueError is raised because "xyz" is not a valid string to convert into an integer.

Question 6: Which of the following will raise a ValueError?

  1. Converting "123" to an integer using int().
  2. Using len() on a list.
  3. Passing a string to int() that cannot be converted to a number.
  4. Adding an integer and a string.
▼

Answer: C) Passing a string to int() that cannot be converted to a number

Explanation: Passing a non-numeric string to int() raises a ValueError because it cannot be converted to an integer. Adding an integer and a string raises a TypeError.

Question 7: Insert the correct exception handling code to catch a ValueError raised by trying to convert a non-numeric string to a float:

try:
    num = float("abc")
except __________:
    print("Invalid value for conversion")
▼

Answer: except ValueError:

Explanation: This code raises a ValueError because "abc" cannot be converted into a floating-point number, and the except ValueError block handles the exception.

Question 8: Which of the following operations can raise a ValueError? (Select all that apply.)

  1. int("abc")
  2. float("xyz")
  3. int(10.5)
  4. math.sqrt(-1) (without using cmath)
▼

Answer: A) int("abc")
B) float("xyz")
D) math.sqrt(-1)

Explanation: int("abc") and float("xyz") raise ValueError because the strings cannot be converted into numbers. math.sqrt(-1) raises ValueError because the square root of a negative number is undefined in the real number system (you need cmath for complex numbers). int(10.5) works because it converts the float to an integer.

Question 9: The _________ exception is raised when attempting to perform a square root of a negative number using the math.sqrt() function.

  • TypeError
  • ValueError
  • ZeroDivisionError
▼

Answer: B) ValueError

Explanation: ValueError is raised when attempting to take the square root of a negative number with math.sqrt() because it is undefined in the real number system.

Question 10: The __________ exception is raised when attempting to convert the string "hello" to a floating-point number using float().

▼

Answer: ValueError

Explanation: A ValueError is raised when trying to convert a non-numeric string like "hello" into a float using the float() function.

Question 11: Arrange the following exceptions in the correct order, from the highest level to the lowest in Python's exception hierarchy.

  1. ValueError
  2. Exception
  3. BaseException
▼

Answer: C) BaseException
B) Exception
A) ValueError

Explanation: BaseException is the root of all exceptions, followed by Exception. ValueError is a subclass of Exception, which represents a specific type of error related to invalid values.

Question 12: Which of the following are true about the ValueError exception in Python? (Select all that apply.)

  1. It is raised when a function receives an argument of the correct type but with an invalid value.
  2. It is a subclass of Exception.
  3. It is raised when accessing an invalid index in a list.
  4. It is raised when an operation is applied to an object of an incorrect type.
▼

Answer: A) It is raised when a function receives an argument of the correct type but with an invalid value.
B) It is a subclass of Exception.

Explanation: ValueError is raised when a function gets an argument of the correct type but with an inappropriate value, such as trying to convert "abc" into an integer. It is a subclass of Exception. Invalid index access raises IndexError, and operations on incorrect types raise TypeError.

Question 13: The abstract exception _________ is the base class for exceptions raised when a function receives an argument with the correct type but an invalid value.

  1. IndexError
  2. TypeError
  3. ValueError
▼

Answer: C) ValueError

Explanation: ValueError is the specific exception raised when an argument has the correct type but an invalid value, such as a string that cannot be converted into a number.

Question 14: Attempting to take the square root of a negative number using math.sqrt() raises a __________ exception.

▼

Answer: ValueError

Explanation: ValueError is raised because taking the square root of a negative number using math.sqrt() is undefined in the real number system.

Question 15: Fill in the blank to handle a ValueError raised by attempting to convert a non-numeric string to an integer:

try:
    num = int("abc")
except __________:
    print("Invalid string for conversion")
▼

Answer: except ValueError:

Explanation: ValueError is raised when trying to convert the string "abc" to an integer, and the except block handles this exception.

Question 16: Which of the following will raise a ValueError?

  1. int("123")
  2. float("10.5")
  3. int("ten")
  4. len([1, 2, 3])
▼

Answer: C) int("ten")

Explanation: int("ten") raises a ValueError because the string "ten" cannot be converted to an integer.

Question 17: Insert the correct code to handle a ValueError when trying to convert a string to an integer:

try:
    value = int("hello")
except __________:
    print("Cannot convert the string to an integer")
▼

Answer: except ValueError:

Explanation: Trying to convert the string "hello" to an integer raises a ValueError, and the except block handles this error.

Question 18: Which of the following operations can raise a ValueError in Python? (Select all that apply.)

  1. Converting "abc" to an integer.
  2. Accessing an invalid index in a list.
  3. Passing a string instead of a number to a mathematical function like math.sqrt().
  4. Taking the square root of a negative number using math.sqrt().
▼

Answer: A) Converting "abc" to an integer.
C) Passing a string instead of a number to a mathematical function like math.sqrt().
D) Taking the square root of a negative number using math.sqrt().

Explanation: A ValueError is raised when trying to convert a string like "abc" to an integer, passing an invalid value to math.sqrt(), or trying to take the square root of a negative number using math.sqrt().

Question 19: In Python, the _________ exception is raised when a function receives an argument with the correct type but an invalid value.

  1. TypeError
  2. IndexError
  3. ValueError
▼

Answer: C) ValueError

Explanation: ValueError is raised when the type of the argument is correct, but its value is not appropriate for the operation, such as passing a string that cannot be converted to a number.

Question 20: Trying to convert a string like "abc" into an integer using int() raises a __________ exception.

▼

Answer: ValueError

Explanation: A ValueError is raised when trying to convert a non-numeric string into an integer, as the value is not appropriate for conversion.

Question 21: Sort the following exceptions in the correct order from the most general to the most specific.

  1. Exception
  2. ValueError
  3. BaseException
▼

Answer: C) BaseException
A) Exception
B) ValueError

Explanation: BaseException is the most general, followed by Exception. ValueError is a specific exception for incorrect values.

Question 22: Which of the following can raise a ValueError in Python? (Select all that apply.)

  1. int("xyz")
  2. math.sqrt(-1)
  3. float("1.23")
  4. int(123.45)
▼

Answer: A) int("xyz")
B) math.sqrt(-1)

Explanation: int("xyz") raises a ValueError because "xyz" cannot be converted to an integer, and math.sqrt(-1) raises a ValueError because the square root of a negative number is undefined in the real number system. float("1.23") and int(123.45) do not raise ValueError.

Question 23: The exception _________ is raised when a string that cannot be converted to a number is passed to the int() function.

  1. ValueError
  2. TypeError
  3. IndexError
▼

Answer: A) ValueError

Explanation: ValueError is raised when the int() function receives a string that cannot be converted into a number, such as "abc".

Question 24: Fill in the blank to catch a ValueError raised when trying to convert a non-numeric string to a float:

try:
    num = float("xyz")
except __________:
    print("Invalid string for conversion")
▼

Answer: except ValueError:

Explanation: A ValueError is raised when trying to convert the string "xyz" to a float, and the except ValueError block handles this error.

Question 25: Which exception is raised when trying to convert a non-numeric string to an integer in Python?

  1. KeyError
  2. IndexError
  3. ValueError
  4. TypeError
▼

Answer: C) ValueError

Explanation: ValueError is raised when trying to convert a non-numeric string (like "abc") into an integer.



Become a Patron!

Follow us on Facebook and Twitter for latest update.

It will be nice if you may share this link in any developer community or anywhere else, from where other developers may find this content. Thanks.

https://w3resource.com/python/certificate/functions-and-exceptions-valueerror.php