What this deck covers
This deck focuses on Lists, giving you a quick way to review the definitions, rules, and examples that matter most for AP Computer Science Principles.
AP Computer Science Principles Flashcards: Lists
Study Lists in AP Computer Science Principles with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.
AP Computer Science Principles
Lists
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QUESTION
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How do you convert a string to a list of characters?
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ANSWER
list(string). Converts each character into a separate list element.
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Flashcard 1: How do you convert a string to a list of characters?
Answer: list(string). Converts each character into a separate list element.
Flashcard 2: What is the result of list.count(x)?
Answer: The number of times x appears in the list. Returns frequency of occurrence for the specified element.
Flashcard 3: Which method returns the smallest item in a list?
Answer: min(list). Built-in function that finds the smallest comparable element.
Flashcard 4: What operation does list.clear() perform?
Answer: Removes all elements from the list. Empties the list completely, leaving it with zero elements.
Flashcard 5: How do you reverse a list in place?
Answer: list.reverse(). Reverses elements in-place without creating a new list.
Flashcard 6: Identify the syntax: [x for x in list if x > 0]
Answer: List comprehension filtering positive elements. Combines iteration with conditional filtering in one expression.
Flashcard 7: How do you create an empty list in Python?
Answer: list = []. Creates an empty list using square bracket notation.
Flashcard 8: What does list.extend(iterable) do?
Answer: Adds elements from the iterable to the end of the list. Extends the list with multiple elements from another collection.
Flashcard 9: Which method removes an element by value in a list?
Answer: list.remove(value). Removes the first matching value from the list.
Flashcard 10: What does list.copy() return?
Answer: A shallow copy of the list. Creates a new list object with the same elements.
Flashcard 11: Which method removes an element by value in a list?
Answer: list.remove(value). Removes the first matching value from the list.
Flashcard 12: Identify the operation: list.append(x)
Answer: Adds element x to the end of the list. Appends to the end, increasing list length by 1.
Flashcard 13: What does list comprehension [x**2 for x in list] produce?
Answer: A list of squares of elements. Applies exponentiation operation to each list element.
Flashcard 14: Identify the method to concatenate two lists.
Answer: list1 + list2. Plus operator combines lists into a new list object.
Flashcard 15: What does list.sort() do?
Answer: Sorts the list in ascending order. Modifies the original list in-place using default ascending order.
Flashcard 16: Identify the operation: list.insert(index, x)
Answer: Inserts element x at the specified index. Places element at specific position, shifting others right.
Flashcard 17: What is the result of list[::-1]?
Answer: The list in reverse order. Negative step creates a reversed copy of the list.
Flashcard 18: How do you iterate over a list with a for loop?
Answer: for element in list:. Iterates through each element without using indices.
Flashcard 19: How do you join a list of strings into a single string?
Answer: 'separator'.join(list). Combines string elements with specified separator between them.
Flashcard 20: What does list.index(x) return?
Answer: The index of the first occurrence of x in the list. Returns position of first match; raises ValueError if not found.
Flashcard 21: What does list.sort() do?
Answer: Sorts the list in ascending order. Modifies the original list in-place using default ascending order.
Flashcard 22: What is a nested list?
Answer: A list that contains other lists as elements. Enables creation of multi-dimensional data structures.
Flashcard 23: How do you reverse a list in place?
Answer: list.reverse(). Reverses elements in-place without creating a new list.
Flashcard 24: What does 'in' keyword check in lists?
Answer: Checks if an element exists in the list. Returns True if element found, False otherwise.
Flashcard 25: What does list[start:end] return?
Answer: A sublist from index start to end-1. End index is exclusive, so it's not included in result.
Flashcard 26: What does list.copy() return?
Answer: A shallow copy of the list. Creates a new list object with the same elements.
Flashcard 27: Identify the operation: list.append(x)
Answer: Adds element x to the end of the list. Appends to the end, increasing list length by 1.
Flashcard 28: What is the complexity of list.append(x)?
Answer: O(1). Constant time since it adds to the end only.
Flashcard 29: What is the default step in list slicing?
Answer:
Flashcard 30: What is the result of len(list)?
Answer: The number of elements in the list. Built-in function that counts all elements in the list.
Flashcard 31: Identify the method to concatenate two lists.
Answer: list1 + list2. Plus operator combines lists into a new list object.
Flashcard 32: How do you access the last element of a list?
Answer: list[-1]. Negative indexing starts from the end of the list.
Flashcard 33: What does list.extend(iterable) do?
Answer: Adds elements from the iterable to the end of the list. Extends the list with multiple elements from another collection.
Flashcard 34: How do you check list equality in Python?
Answer: Using the '==' operator. Compares element by element for both content and order.
Flashcard 35: What is the index of the first element in a list?
Answer:
Flashcard 36: Identify the operation: list.insert(index, x)
Answer: Inserts element x at the specified index. Places element at specific position, shifting others right.
Flashcard 37: What is the complexity of list.append(x)?
Answer: O(1). Constant time since it adds to the end only.
Flashcard 38: What is the purpose of a list index?
Answer: To access a specific element in the list by its position. Indices provide direct access to elements without iteration.
Flashcard 39: What is slicing in the context of lists?
Answer: Extracting a portion of the list using indices. Creates sublists using start and end index boundaries.
Flashcard 40: What type of data structure is a list in Python?
Answer: Mutable, ordered collection. Lists can be modified after creation and maintain element order.
Flashcard 41: Which method returns the largest item in a list?
Answer: max(list). Built-in function that finds the largest comparable element.
Flashcard 42: What is slicing in the context of lists?
Answer: Extracting a portion of the list using indices. Creates sublists using start and end index boundaries.
Flashcard 43: What is the result of list.count(x)?
Answer: The number of times x appears in the list. Returns frequency of occurrence for the specified element.
Flashcard 44: Which method removes an element by index in a list?
Answer: list.pop(index). Removes and returns the element at the specified position.
Flashcard 45: What is the default step in list slicing?
Answer:
Flashcard 46: What does list.index(x) return?
Answer: The index of the first occurrence of x in the list. Returns position of first match; raises ValueError if not found.
Flashcard 47: Identify the syntax: [x for x in list if x > 0]
Answer: List comprehension filtering positive elements. Combines iteration with conditional filtering in one expression.
Flashcard 48: What does 'in' keyword check in lists?
Answer: Checks if an element exists in the list. Returns True if element found, False otherwise.
Flashcard 49: What does list[start:end] return?
Answer: A sublist from index start to end-1. End index is exclusive, so it's not included in result.
Flashcard 50: How do you access the last element of a list?
Answer: list[-1]. Negative indexing starts from the end of the list.
Flashcard 51: How do you create an empty list in Python?
Answer: list = []. Creates an empty list using square bracket notation.
Flashcard 52: Which function returns the sum of elements in a list?
Answer: sum(list). Built-in function that adds all numeric elements together.
Flashcard 53: Which function returns the sum of elements in a list?
Answer: sum(list). Built-in function that adds all numeric elements together.
Flashcard 54: What is a nested list?
Answer: A list that contains other lists as elements. Enables creation of multi-dimensional data structures.
Flashcard 55: What type of data structure is a list in Python?
Answer: Mutable, ordered collection. Lists can be modified after creation and maintain element order.
Flashcard 56: How do you join a list of strings into a single string?
Answer: 'separator'.join(list). Combines string elements with specified separator between them.
Flashcard 57: Which method returns the largest item in a list?
Answer: max(list). Built-in function that finds the largest comparable element.
Flashcard 58: What is the purpose of a list index?
Answer: To access a specific element in the list by its position. Indices provide direct access to elements without iteration.
Flashcard 59: How do you check list equality in Python?
Answer: Using the '==' operator. Compares element by element for both content and order.
Flashcard 60: Identify error: list.pop(-1) on empty list.
Answer: IndexError: pop from empty list. Cannot remove elements from a list with no elements.
Flashcard 61: What is the complexity of list.pop()?
Answer: O(1) for last element, O(n) for others. Last element removal is instant; others require shifting.
Flashcard 62: Find the error: list[1] = 100 on list of length 1.
Answer: IndexError: list index out of range. Index 1 doesn't exist in a list with only one element.
Flashcard 63: Which method returns the smallest item in a list?
Answer: min(list). Built-in function that finds the smallest comparable element.
Flashcard 64: What is the result of len(list)?
Answer: The number of elements in the list. Built-in function that counts all elements in the list.
Flashcard 65: Which method removes an element by index in a list?
Answer: list.pop(index). Removes and returns the element at the specified position.
Flashcard 66: What is the complexity of list.pop()?
Answer: O(1) for last element, O(n) for others. Last element removal is instant; others require shifting.
Flashcard 67: What is a list comprehension?
Answer: A concise way to create lists. Enables functional programming style for list creation.
Flashcard 68: What is the index of the first element in a list?
Answer:
Flashcard 69: What does list comprehension [x**2 for x in list] produce?
Answer: A list of squares of elements. Applies exponentiation operation to each list element.
Flashcard 70: How do you iterate over a list with a for loop?
Answer: for element in list:. Iterates through each element without using indices.
Flashcard 71: How do you convert a string to a list of characters?
Answer: list(string). Converts each character into a separate list element.
Flashcard 72: Find the error: list[1] = 100 on list of length 1.
Answer: IndexError: list index out of range. Index 1 doesn't exist in a list with only one element.
Flashcard 73: What is the result of list[::-1]?
Answer: The list in reverse order. Negative step creates a reversed copy of the list.
Flashcard 74: What is a list comprehension?
Answer: A concise way to create lists. Enables functional programming style for list creation.
Flashcard 75: What is a list in computer science?
Answer: A collection of elements, typically of the same type, in a specific order. An ordered data structure that allows indexing and modification.
Flashcard 76: Identify error: list.pop(-1) on empty list.
Answer: IndexError: pop from empty list. Cannot remove elements from a list with no elements.
Flashcard 77: What is a list in computer science?
Answer: A collection of elements, typically of the same type, in a specific order. An ordered data structure that allows indexing and modification.
Flashcard 78: What operation does list.clear() perform?
Answer: Removes all elements from the list. Empties the list completely, leaving it with zero elements.