Tuples in Python Programming PDF

Tuples in Python Programming Answers 1. What distinguishes tuples from lists in Python? A. Tuples are immutable and cannot be changed after creation. B. Tuples are mutable while lists are immutable. C. Tuples cannot be indexed by integers. D. Tuples can contain only string elements....

Tuples in Python Programming Answers 1. What distinguishes tuples from lists in Python? A. Tuples are immutable and cannot be changed after creation. B. Tuples are mutable while lists are immutable. C. Tuples cannot be indexed by integers. D. Tuples can contain only string elements. Answer: Tuples are immutable and cannot be changed after creation. (A) Tuples are immutable, meaning their content cannot be changed after they are created. 2. How are tuples typically enclosed in Python code? A. In square brackets [] B. In single quotes '' C. In parentheses () D. In curly braces {} Answer: In parentheses () (C) Tuples are commonly enclosed in parentheses to identify them in Python code. 3. What happens when a tuple is defined with just a single string in parentheses, without a comma? A. It creates an empty tuple. B. It creates a new tuple with one element. C. It is treated as a string expression within parentheses. D. It results in a syntax error. Answer: It is treated as a string expression within parentheses. (C) Without the comma, a single string in parentheses is treated as a string expression. 4. How does Python determine the order when comparing tuples? A. By comparing elements from left to right until they differ. B. By comparing the last elements first. C. By using a random selection of elements. D. By the size of the tuples. Answer: By comparing elements from left to right until they differ. (A) Python compares tuples by looking at elements from left to right until it finds differing elements. 5. When using the sort function on a list of tuples, what is the primary sorting criterion? A. The alphabetical order of the tuples B. The first element of each tuple C. The length of the tuples D. The total number of elements in each tuple Answer: The first element of each tuple (B) The sort function primarily sorts tuples based on the first element. 6. What is the result of using the keyword argument reverse=True in the sort function? A. It sorts the tuples in alphabetical order only. B. It sorts the tuples in descending order. C. It only reverses the order of the tuples without sorting. D. It sorts the tuples in ascending order. Answer: It sorts the tuples in descending order. (B) The reverse=True argument sorts the tuples in descending order. 7. What unique syntactic feature does Python offer regarding tuple assignment? A. Tuples can be assigned on the left side of an assignment statement to multiple variables. B. Tuples cannot be used on the left side of an assignment at all. C. Tuples can only be used inside functions when assigning multiple variables. D. Tuples can only be assigned one element at a time. Answer: Tuples can be assigned on the left side of an assignment statement to multiple variables. (A) Python allows tuples on the left side of an assignment statement to assign multiple variables at once. 8. What should you avoid using as a variable name in Python due to its role in tuple creation? A. list B. tuple C. set D. dict Answer: tuple (B) You should avoid using 'tuple' as a variable name because it is the name of a constructor. 9. What kind of errors are commonly caused by incorrect shape in compound data structures? A. Compilation errors B. Syntax errors C. Shape errors D. Semantic errors Answer: Shape errors (C) Shape errors occur when a data structure has the wrong type, size, or composition. 10. Which built-in functions in Python can reorder a sequence? A. sorted and reversed B. changed and modified C. ordered and disordered D. sorted and shifted Answer: sorted and reversed (A) The functions sorted and reversed can arrange the elements of a sequence in different orders. 11. What should you do first when debugging a program? A. Check all recent changes B. Run experiments immediately C. Rebuild the program from scratch D. Examine and read your code Answer: Examine and read your code (D) Examining and reading your code can help clarify what the issue might be. 12. What can ‘random walk programming’ lead to during debugging? A. Efficient solutions B. Focused testing of hypotheses C. Clear understanding of errors D. Wasted time and effort Answer: Wasted time and effort (D) Random walk programming involves making random changes, which can take a long time to yield results. 13. What is one recommended activity when troubleshooting code other than reading it? A. Rewriting the code completely B. Running small, simple tests C. Ignoring error messages D. Avoiding changes to the code Answer: Running small, simple tests (B) Running small, simple tests can help in understanding the problem better. 14. Which of the following activities is NOT suggested in the debugging process? A. Revisiting and understanding previous changes B. Making random changes without hesitation C. Explaining the problem out loud D. Taking breaks Answer: Making random changes without hesitation (B) Making random changes without thought can lead to ineffective debugging. 15. Which approach is suggested when you encounter too many errors in your program? A. Run the program until it crashes B. Simplify your program gradually C. Refactor without backing up D. Ignore the errors and write new code Answer: Simplify your program gradually (B) Retreating and simplifying the program can help in isolating and fixing errors. 16. In Exercise 1, what data structure is recommended to count the number of messages from each person? A. A dictionary B. A set C. A list D. A tuple Answer: A dictionary (A) Using a dictionary is effective for counting occurrences of messages associated with each person. 17. What should your program do when counting letter frequency according to Exercise 3? A. Ignore non-letter characters B. Only count uppercase letters C. Count digits as well D. Count all characters including spaces Answer: Ignore non-letter characters (A) The program should only count letters a-z and ignore all other characters. 18. What is an effective method to clarify your debugging thought process? A. Focus solely on the code without distractions B. Ignore external suggestions C. Keep quiet and work alone D. Talk about it with someone else Answer: Talk about it with someone else (D) Explaining the problem to someone else can often lead to insights and potential solutions. 19. What is a requirement for tuple assignment in Python? A. The number of variables on the left must match the number of values on the right. B. Variables must be of the same type to use tuple assignment. C. Tuples cannot be on the left side of the assignment. D. Tuple assignment can only be used with lists. Answer: The number of variables on the left must match the number of values on the right. (A) The number of variables on the left must equal the number of values on the right for successful tuple assignment. 20. How can tuples be beneficial when used as dictionary keys? A. Tuples are hashable, unlike lists. B. Tuples allow for duplicate entries. C. Tuples can hold mixed data types. D. They are mutable and can be changed after creation. Answer: Tuples are hashable, unlike lists. (A) Since tuples are hashable, they can be used as keys in dictionaries, while lists cannot. 21. When constructing a list of tuples to sort a dictionary by value, what should the first element be? A. The value itself (value, key). B. The count of occurrences of the value. C. The key associated with the value (key, value). D. A unique identifier for each key-value pair. Answer: The value itself (value, key). (A) The first element in the list of tuples should be the value if you want to sort the dictionary by that value. 22. Which statement about lists and tuples is true? A. Lists are more memory efficient than tuples. B. Tuples are immutable, while lists are mutable. C. Tuples can be modified after they are created. D. Both lists and tuples can use the same methods for sorting. Answer: Tuples are immutable, while lists are mutable. (B) Tuples are immutable, meaning their contents cannot be changed once created, while lists can be modified. 23. What method returns a list of tuples representing the key-value pairs in a dictionary? A. values() B. items() C. pairs() D. get_items() Answer: items() (B) The items() method returns a list of tuples, where each tuple consists of a key- value pair from the dictionary. 24. What can be said about the order of items returned by the items() method of a dictionary? A. It guarantees the order of insertion. B. The items are returned in a random order. C. It maintains an order based on the data type of keys. D. The order is determined by the alphabetical order of keys. Answer: The items are returned in a random order. (B) The items returned by the items() method are in no particular order. 25. Why are tuples sometimes preferred over lists for function arguments? A. Using tuples reduces unexpected behavior due to aliasing. B. Tuples can be sorted in place. C. Tuples can hold larger amounts of data. D. Tuples require less coding effort. Answer: Using tuples reduces unexpected behavior due to aliasing. (A) Using tuples as function arguments helps to avoid unexpected behavior because they are immutable, unlike lists. 26. What is a valid use case for tuple assignment? A. To merge two lists into one B. To modify the elements of a string C. To iterate through dictionary keys and values D. To sort a list of integers Answer: To iterate through dictionary keys and values (C) Tuple assignment is often used when iterating through key-value pairs in a dictionary. 27. How can a tuple be used to enhance the output of a program that analyzes text? A. By creating a single variable to hold all values. B. By allowing multiple strings to be combined. C. By pairing word counts with the words themselves in a tuple. D. By using it to hold mutable data. Answer: By pairing word counts with the words themselves in a tuple. (C) Using tuples to pair word counts with words enhances the analysis by facilitating sorting and organizing the data. 28. In what way can tuples be compared when sorting? A. Tuples are not comparable. B. The order of elements does not affect the comparison. C. Both elements are considered, first by the first element then the second. D. Only the first elements are considered in comparisons. Answer: Both elements are considered, first by the first element then the second. (C) Tuples can be compared as a whole, first checking the first element and then the second in case of ties. 29. For a dictionary that maps from last-name, first-name pairs to telephone numbers, what should be used as the key? A. An integer index for each entry. B. A tuple of the last name and the first name. C. A string combining the first and last names. D. A list containing the first and last names. Answer: A tuple of the last name and the first name. (B) A tuple is an ideal choice as a composite key for mapping pairs like last-name and first-name. 30. What can be said about using sequences of sequences in programming? A. They can simplify the representation of complex data. B. They can only be implemented in lists. C. They are always mutable. D. They are not interchangeable in most contexts. Answer: They can simplify the representation of complex data. (A) Using sequences of sequences can help simplify and enhance the representation of complex data structures. 31. What happens when multiple tuples have the same first element during sorting? A. The second element is compared to determine order. B. All tuples are treated as equal and remain in the original order. C. Only the first tuple is kept, others are discarded. D. They are placed in an unsorted section. Answer: The second element is compared to determine order. (A) When the first elements are the same, the second element of the tuples is used to sort the tuples further. 32. Which scenario represents a situation where a list would be more suitable than a tuple? A. When the data needs to remain constant. B. When creating composite keys for a dictionary. C. When the sequence needs to be modified after creation. D. When multiple data types are involved. Answer: When the sequence needs to be modified after creation. (C) Lists are more suitable when you require the ability to modify the data after its creation.