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Questions and Answers
What is the result of calling the sort method on a list?
What is the result of calling the sort method on a list?
Which of the following methods is classified as a mutator method?
Which of the following methods is classified as a mutator method?
What value does a mutator method return upon execution?
What value does a mutator method return upon execution?
Consider the following list: example = [4, 2, 10, 8]. What will example look like after executing example.sort()?
Consider the following list: example = [4, 2, 10, 8]. What will example look like after executing example.sort()?
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When comparing elements in a list for sorting, which operation is primarily used?
When comparing elements in a list for sorting, which operation is primarily used?
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What is the primary difference between a list and a dictionary in Python?
What is the primary difference between a list and a dictionary in Python?
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Which of the following is a method that can manipulate a list in Python?
Which of the following is a method that can manipulate a list in Python?
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In what scenario would a dictionary be preferred over a list?
In what scenario would a dictionary be preferred over a list?
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Which statement best describes the access of items in a list?
Which statement best describes the access of items in a list?
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What is a key characteristic of dictionaries compared to lists?
What is a key characteristic of dictionaries compared to lists?
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How do you define a simple function that returns a value in Python?
How do you define a simple function that returns a value in Python?
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Which method would you use to remove an item from a list in Python?
Which method would you use to remove an item from a list in Python?
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What type of data can be stored in a list in Python?
What type of data can be stored in a list in Python?
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What does the operator 'in' do when applied to a list?
What does the operator 'in' do when applied to a list?
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When replacing an element in a list using the subscript operator, what is being referenced?
When replacing an element in a list using the subscript operator, what is being referenced?
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What will be the output of 'print([1, 2, 3, 4])' in Python?
What will be the output of 'print([1, 2, 3, 4])' in Python?
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What will the following code snippet produce? 'numbers = [2, 3, 4, 5]; for index in range(len(numbers)): numbers[index] = numbers[index] ** 2'
What will the following code snippet produce? 'numbers = [2, 3, 4, 5]; for index in range(len(numbers)): numbers[index] = numbers[index] ** 2'
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What does the method L.append(element) accomplish?
What does the method L.append(element) accomplish?
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Which statement about lists is true?
Which statement about lists is true?
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If L contains 4 elements, which index would L.insert(index, element) place the element at if index is 5?
If L contains 4 elements, which index would L.insert(index, element) place the element at if index is 5?
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What is the result of the operation 'words = sentence.split()' where sentence is 'This example has five words.'?
What is the result of the operation 'words = sentence.split()' where sentence is 'This example has five words.'?
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After executing 'for index in range(len(words)): words[index] = words[index].upper()', what will 'words' contain?
After executing 'for index in range(len(words)): words[index] = words[index].upper()', what will 'words' contain?
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What would L.pop() return if L is currently [3, 5, 7]?
What would L.pop() return if L is currently [3, 5, 7]?
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Which of the following accurately describes L.extend(aList)?
Which of the following accurately describes L.extend(aList)?
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What happens if you attempt to access an index in a list that does not exist?
What happens if you attempt to access an index in a list that does not exist?
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What happens when the L.insert(index, element) method is called with index less than 0?
What happens when the L.insert(index, element) method is called with index less than 0?
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How does L.pop(index) differ from L.pop()?
How does L.pop(index) differ from L.pop()?
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What will be the state of example after executing example.insert(1, 10) on the initial list [1, 2]?
What will be the state of example after executing example.insert(1, 10) on the initial list [1, 2]?
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If L contains [1, 2, 3] and L.pop(0) is executed, what will L be afterward?
If L contains [1, 2, 3] and L.pop(0) is executed, what will L be afterward?
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What does the method append do in a list?
What does the method append do in a list?
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What is the result of using the extend method?
What is the result of using the extend method?
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What happens if you try to find the index of an element that is not in the list using the index method?
What happens if you try to find the index of an element that is not in the list using the index method?
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What does the pop method do when called without an argument?
What does the pop method do when called without an argument?
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Which of the following gives the correct behavior of the in keyword when used with lists?
Which of the following gives the correct behavior of the in keyword when used with lists?
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What is a defining characteristic of each item in a list?
What is a defining characteristic of each item in a list?
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What is the result of the following operation: example + [14, 15]?
What is the result of the following operation: example + [14, 15]?
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What will be the contents of the 'example' list after executing example.pop(0)?
What will be the contents of the 'example' list after executing example.pop(0)?
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Which of the following represents a valid list literal in Python?
Which of the following represents a valid list literal in Python?
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How can you create a list of integers from 1 to 4 in Python?
How can you create a list of integers from 1 to 4 in Python?
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What will the statement print when the target 45 is searched in aList = [34, 45, 67]?
What will the statement print when the target 45 is searched in aList = [34, 45, 67]?
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What does the len function return when applied to a list?
What does the len function return when applied to a list?
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What will the output be for the expression first[2:4] given first = [1, 2, 3, 4]?
What will the output be for the expression first[2:4] given first = [1, 2, 3, 4]?
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What is the correct output of the expression first + [5, 6]?
What is the correct output of the expression first + [5, 6]?
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When comparing two lists using the equality operator (==), what does it return?
When comparing two lists using the equality operator (==), what does it return?
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Which of the following is NOT a method for creating a list?
Which of the following is NOT a method for creating a list?
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Study Notes
Chapter 5: Lists and Dictionaries
-
Lists are sequences of data values (items or elements)
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List items can be of any type
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Examples include shopping lists, to-do lists, rosters, guest lists, recipes, documents, and phone books
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Each item in a list has a unique index specifying its position (starting from 0)
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List Literals: Examples include
['apples', 'oranges', 'cherries'],[[5, 9], [541, 78]] -
Lists can contain expressions to be evaluated, such as
[x, math.sqrt(x)]whenx = 2becomes[2, 1.4142135623730951]or[x + 1]when x=2 becomes[3] -
Lists of integers can be created using the
rangefunction, such aslist(range(1, 5))which becomes[1, 2, 3, 4] -
The
list()function can create a list from any iterable sequence. For instance,list("Hi there!")produces['H', 'i', ' ', 't', 'h', 'e', 'r', 'e', '!'] -
Basic List Operators:
- The
lenfunction, square brackets[]for accessing elements, the + operator for concatenation, and the==operator for equality all work as expected with lists - Examples -
len(first) = 4,first[0] = 1,first + [5, 6]produces[1, 2, 3, 4, 5, 6], and comparing a list to another as infirst == second
- The
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Printing Lists: To display list content, use the
print()function. For instance,print([1, 2, 3, 4])yields[1, 2, 3, 4] -
inOperator (Membership Testing): Theinoperator checks if an element is present in a list.3 in [1, 2, 3]isTrue, while0 in [1, 2, 3]isFalse
Replacing an Element in a List
- Lists are mutable. Elements can be changed
- The subscript operator
[]is used to replace elements, e.g.,example = [1, 2, 3, 4]; example[3] = 0; examplebecomes[1, 2, 3, 0] - The index refers to an element's position within the list, not the list itself
List Methods (Inserting and Removing Elements)
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append(e): Addseto the end of a list -
extend(aList): Adds elements inaListto the end of the list -
insert(index, element): Insertselementat index(index)in the list. Inserts element at the end if index is out of bounds -
pop(): Removes and returns element at the end of the list; returnsNone -
pop(index): Removes and returns the element at index
List Methods (Continued)
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append,extend,insert,pop, andsortfall under the category of "mutator methods" and typically don't return a value - Python commonly returns
Nonewith these methods -
aList.sort()orprint(aList.sort())returnsNone
Searching a List
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inoperator: Checks for an element's existence in a list but does not return the element's position -
index()method: Locates an element's position in a list. Raises an error if the element is not found.
Sorting a List
- Lists are ordered by position – elements maintain their order.
- The
sort()method rearranges a list's elements based on natural ordering using "<", ">", and "==" -
example = [4, 2, 10, 8]; example.sort(); example = [2, 4, 8, 10]
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Description
Explore the foundational concepts of lists and dictionaries in programming. This quiz covers list creation, indexing, and basic operations, along with practical examples. Test your understanding of how lists can store various data types and evaluate expressions.
