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PCEP Certification Practice Test: Using in and not in Operators

PCEP Certification Practice Test - Questions, Answers and Explanations

Here are 25 questions focusing on the topic "the in and not in operators" within the context of lists in Python for the PCEP-30-02 certification exam. The questions include various formats like single-select, multiple-select, gap fill, code insertion, sorting, and "rearrange" style questions, each with answers and explanations.

Question 1: Which of the following statements correctly checks if the element "apple" is in the list fruits?

  1. "apple" in fruits
  2. "apple" not in fruits
  3. if "apple" fruits
  4. if fruits in "apple"
▼

Answer: a) "apple" in fruits

Explanation: The correct syntax to check for an element in a list is element in list. In this case, "apple" in fruits is the correct check.

Question 2: What will the following code output?

numbers = [1, 2, 3, 4, 5]
if 3 in numbers:
    print("Found")
else:
    print("Not Found")
  1. Found
  2. Not Found
  3. Error
  4. None
▼

Answer: a) Found

Explanation: The in operator checks if 3 is present in the list numbers, which it is, so "Found" is printed.

Question 3: Which of the following is the correct way to check if the element "banana" is NOT in the list fruits?

  1. "banana" in fruits
  2. "banana" not fruits
  3. "banana" not in fruits
  4. fruits in "banana"
▼

Answer: c) "banana" not in fruits

Explanation: The correct syntax to check if an element is NOT in a list is "element" not in list.

Question 4: Which of the following expressions will evaluate to True? (Choose all that apply)

  1. "cat" in ["dog", "cat", "mouse"]
  2. 5 not in [1, 2, 3, 4]
  3. 7 in [1, 2, 7, 8]
  4. "apple" not in ["banana", "grape"]
▼

Answer: a) "cat" in ["dog", "cat", "mouse"], b) 5 not in [1, 2, 3, 4], c) 7 in [1, 2, 7, 8], d) "apple" not in ["banana", "grape"]

Explanation: In option a), "cat" is present in the list. In option b) 5 not in [1, 2, 3, 4]: This is true because 5 is not in the list. In option c), 7 is present in the list. In option d), "apple" is not in the list, so not in evaluates to True.

Question 5: Which of the following statements correctly uses the in and not in operators?

  1. if "x" in my_list: print("Exists")
  2. if not "x" in my_list: print("Doesn't Exist")
  3. if "x" not in my_list: print("Doesn't Exist")
  4. if my_list not in "x": print("Exists")
▼

Answer: a) if "x" in my_list: print("Exists"), b) if not "x" in my_list: print("Doesn't Exist"), c) if "x" not in my_list: print("Doesn't Exist")

Explanation: Option a) checks if "x" is in the list, and option b) Checks if "x" is not in my_list, c) correctly checks if "x" is NOT in the list.

Question 6: The expression if __________ in my_list: is used to check if an element is present in the list.

▼

Answer: element

Explanation: The correct syntax is if element in my_list: to check if element is present in the list.

Question 7: The expression if __________ not in my_list: is used to check if an element is absent from the list.

▼

Answer: element

Explanation: The correct syntax is if element not in my_list: to check if element is NOT present in the list.

Question 8: Arrange the following code statements in the correct order to check if "grape" is in the list and print "Found" if it is:

  1. fruits = ["apple", "banana", "grape"]
  2. if "grape" in fruits:
  3. print("Found")
▼

Answer: a) fruits = ["apple", "banana", "grape"]
b) if "grape" in fruits:
c) print("Found")

Explanation: The list is defined first, followed by the conditional check using in, and then the result is printed.

Question 9: Arrange the following code snippets in the correct order to check if the number 10 is not in the list and print "Not Found" if it isn’t:

  1. if 10 not in numbers:
  2. numbers = [1, 2, 3, 4, 5]
  3. print("Not Found")
▼

Answer:

  1. numbers = [1, 2, 3, 4, 5]
  2. if 10 not in numbers:
  3. print("Not Found")

Explanation: The list is defined first, followed by the conditional check using not in, and then the result is printed.

Question 10: Complete the code to check if "orange" is in the list fruits and print "Exists" if it is:

fruits = ["apple", "banana", "cherry"]
if __________:
    print("Exists")
▼

Answer: "orange" in fruits

Explanation: The correct condition is "orange" in fruits to check for the presence of "orange" in the list.

Question 11: Complete the code to check if the number 7 is NOT in the list numbers and print "Missing" if it isn’t:

numbers = [2, 4, 6, 8, 10]
if __________:
    print("Missing")
▼

Answer: 7 not in numbers

Explanation: The correct condition is 7 not in numbers to check for the absence of 7 in the list.

Question 12: Insert the correct code to check if "kiwi" is in the list fruits and print "Present" if it is:

fruits = ["apple", "banana", "kiwi"]
__________
    print("Present")
▼

Answer: if "kiwi" in fruits:

Explanation: The if "kiwi" in fruits: condition checks if "kiwi" is in the list and prints "Present" if it is.

Question 13: Insert the correct code to check if the number 15 is NOT in the list numbers and print "Not Found" if it isn’t:

numbers = [5, 10, 20, 25]
__________
    print("Not Found")
▼

Answer: if 15 not in numbers:

Explanation: The if 15 not in numbers: condition checks if 15 is NOT in the list and prints "Not Found" if it isn’t.

Question 14: Rearrange the code to check if "strawberry" is NOT in the list and print "Missing" if it isn’t:

  1. print("Missing")
  2. fruits = ["apple", "banana", "kiwi"]
  3. if "strawberry" not in fruits:
▼

Answer: b) fruits = ["apple", "banana", "kiwi"]
c) if "strawberry" not in fruits:
a) print("Missing")

Explanation: The list is defined first, followed by the conditional check using not in, and then the result is printed.

Question 15: Organize the steps to check if the number 25 is in the list and print "Found" if it is:

  1. if 25 in numbers:
  2. print("Found")
  3. numbers = [10, 15, 25, 35]
▼

Answer: c) numbers = [10, 15, 25, 35]
a) if 25 in numbers:
b) print("Found")

Explanation: The list is created first, followed by the conditional check using in, and each element is printed.

Question 16: What does the following code output?

colors = ["red", "green", "blue"]
if "yellow" in colors:
    print("Exists")
else:
    print("Not Found")
  1. Exists
  2. Not Found
  3. Error
  4. None
▼

Answer: b) Not Found

Explanation: The color "yellow" is not in the list, so the else block is executed, printing "Not Found".

Question 17: What does the following code output?

animals = ["dog", "cat", "bird"]
if "dog" not in animals:
    print("Missing")
else:
    print("Present")
  1. Present
  2. Missing
  3. Error
  4. None
▼

Answer: a) Present

Explanation: The condition if "dog" not in animals: is false because "dog" is in the list, so the else block is executed.

Question 18: The expression "apple" in fruits returns True if "apple" is present in the list fruits.

  1. True
  2. False
▼

Answer: a) True

Explanation: The in operator returns True if the element is in the list.

Question 19: The expression "banana" not in fruits returns True if "banana" is NOT present in the list fruits.

  1. True
  2. False
▼

Answer: a) True

Explanation: The not in operator returns True if the element is absent from the list.

Question 20: What happens if you check for an element in an empty list using the in operator?

  1. The expression always returns False
  2. The expression raises an error
  3. The expression always returns True
  4. The expression checks only the first element
▼

Answer: a) The expression always returns False

Explanation: An empty list contains no elements, so any in check will return False.

Question 21: Which of the following statements about the in and not in operators is correct?

  1. The in operator checks only the first element in a list.
  2. The in operator can be used with both lists and strings.
  3. The not in operator is slower than the in operator.
  4. The in operator checks for elements in reverse order.
▼

Answer: b) The in operator can be used with both lists and strings.

Explanation: The in operator can be used with various data types, including lists and strings.

Question 22: Which of the following expressions would correctly check if an element is in the middle of a list?

  1. if "middle" in my_list[1:-1]:
  2. if "middle" not in my_list[1:-1]:
  3. if "middle" in my_list[::2]:
  4. if "middle" not in my_list[::-1]:
▼

Answer: a) if "middle" in my_list[1:-1]:

Explanation: The slice my_list[1:-1] represents the middle portion of the list, excluding the first and last elements.

Question 23: Fill in the blank: The not in operator is used to check if an element is __________ from a list.

▼

Answer: absent

Explanation: The not in operator checks if an element is absent from a list.

Question 24: The in operator is used to check if an element is __________ in a list.

▼

Answer: present

Explanation: The in operator checks if an element is present in a list.

Question 25: What is the output of the following code?

letters = ["a", "b", "c", "d"]
if "e" not in letters:
    print("Missing")
  1. Missing
  2. Found
  3. None
  4. Error
▼

Answer: a) Missing

Explanation: The condition checks if "e" is absent from the list. Since "e" is not in the list, "Missing" is printed.

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