In Python, the length of a list refers to the number of elements (items) contained within the list. You can determine the length of a list using the built-in len() function. The length represents the count of elements in the list, and it is an essential metric when working with lists.
Here’s how to find the length of a list using the len() function:
python
my_list = [1, 2, 3, 4, 5] length = len(my_list) print(length) # Output: 5
The len() function returns an integer representing the number of elements in the list.
Now, Here are some MCQs based on Python list length:
MCQ 1: What does the length of a Python list represent?
- A) The total memory consumed by the list
- B) The number of elements in the list
- C) The maximum value in the list
- D) The sum of all elements in the list
Answer: B) The number of elements in the list
- Explanation: The length of a Python list represents the count of elements (items) in the list.
MCQ 2: How can you find the length of a list named my_list?
- A)
my_list.length() - B)
count(my_list) - C)
length(my_list) - D)
len(my_list)
Answer: D) len(my_list)
- Explanation: The
len()function is used to find the length (number of elements) of a list in Python.
MCQ 3: What data type does the len() function return?
- A) float
- B) integer
- C) string
- D) boolean
Answer: B) integer
- Explanation: The
len()function returns an integer representing the length of a list.
MCQ 4: If a Python list is empty, what is the length of the list?
- A) 1
- B) 0
- C) -1
- D) None
Answer: B) 0
- Explanation: An empty list has a length of 0.
MCQ 5: What is the result of len([]) in Python?
- A) 1
- B) 0
- C) -1
- D) None
Answer: B) 0
- Explanation: The
len([])expression returns 0 since the list is empty.
MCQ 6: How can you find the length of a list named my_list without using the len() function?
- A)
count(my_list) - B)
length(my_list) - C)
my_list.size() - D)
my_list.length
Answer: D) my_list.length
- Explanation: The
len()function is the standard way to find the length of a list in Python. Other options listed are not standard.
MCQ 7: What is the output of the following code?
python
my_list = [1, 2, [3, 4], 5] length = len(my_list) print(length)
- A) 4
- B) 5
- C) 6
- D) 7
Answer: A) 4
- Explanation: The length of
my_listis 4 because it contains four elements, including a nested list.
MCQ 8: Which Python data structure can be used to represent a collection of elements with a fixed length?
- A) List
- B) Tuple
- C) Set
- D) Dictionary
Answer: B) Tuple
- Explanation: Unlike lists, tuples in Python have a fixed length and are immutable.