Q1. What is a list in Python?
A list is a mutable, ordered collection of items, which can be of different types.
Lists are created with square brackets [].
Example:
Lists are created with square brackets [].
Example:
my_list = [1, "hello", 3.14]Q2. How do you add elements to a list?
Use append() to add at the end, insert(index, value) at a specific position, or extend() to add multiple items from another iterable.
Concatenation (+) creates a new list.
Example:
Concatenation (+) creates a new list.
Example:
lst.append(10)
lst.insert(0, 5)
lst.extend([6,7])Q3. How do you remove elements from a list?
Remove by value: remove(value) removes the first occurrence.
Remove by index: pop(index) (default last) returns the removed element.
Delete by slice: del lst[start:end].
Clear all: clear().
Example:
Remove by index: pop(index) (default last) returns the removed element.
Delete by slice: del lst[start:end].
Clear all: clear().
Example:
lst.remove(10)
last = lst.pop()
del lst[1:3]Q4. What is list slicing?
Slicing extracts a portion of a list using the syntax [start:stop:step]. It returns a new list.
Example:
Example:
sub = lst[2:5] # elements at index 2,3,4
rev = lst[::-1] # reverse listQ5. How do you sort a list?
Use list.sort() for in-place sorting, or sorted(list) for a new sorted list.
Example:
Example:
lst.sort() # ascending
lst.sort(reverse=True) # descending
new_list = sorted(lst) # new list