Lists and Boolean Flashcards
What is the syntax for creating a list?
my_list = [1, 2, 3].
How to add an item to the end of a list?
Use .append(item) (e.g., my_list.append(4) → [1, 2, 3, 4]).
How to combine two lists?
Use .extend() or + (e.g., [1,2].extend([3,4]) → [1,2,3,4]).
How to insert an item at a specific index?
Use .insert(index, item) (e.g., [1,3].insert(1,2) → [1,2,3]).
How to remove the first occurrence of a value?
Use .remove(value) (e.g., [1,2,2].remove(2) → [1,2]).
How to remove and return an item by index?
Use .pop(index) (defaults to last item if no index is provided).
How to sort a list in-place?
Use .sort() (e.g., [3,1,2].sort() → [1,2,3]).
How to reverse a list in-place?
Use .reverse() (e.g., [1,2,3].reverse() → [3,2,1]).
What is list slicing syntax?
list[start:end:step] (e.g., [1,2,3,4][1:3] → [2,3]).
How to create a list with list comprehension?
[x*2 for x in range(3)] → [0, 2, 4].
What is the difference between [1,2] + [3] and .append(3)?
+ creates a new list; .append() modifies the original.
What is a boolean value?
True or False (capitalized).
What values are considered falsy in Python?
0, '', None, [], {}, (), False.
What is the output of bool('Hello')?
True (non-empty strings are truthy).
What is the output of bool([])?
False (empty lists are falsy).
How to check if a list contains a value?
Use in (e.g., 2 in [1,2,3] → True).
What does all([True, 1, 'non-empty']) return?
True (checks if all elements are truthy).
What does any([False, 0, 'text']) return?
True (checks if any element is truthy).
What is short-circuit evaluation?
Stops evaluating expressions early (e.g., False and ... → False).
How to negate a boolean?
Use not (e.g., not True → False).
