Lists

"""
TODO: I need some way to verify that I remember the important operations. Right now I can remember a handful of the things off the top of my head but I inevitably forget something. I think the ideal would be to have some kind of random quiz that asks you to accomplish certain things, and it makes sure it tests for every thing you can do with lists.
"""


# Create a list
my_list = [1, 2, 3, 4, 5]

# Access elements
first_element = my_list[0]         # Access the first element
last_element = my_list[-1]         # Access the last element

# Modify elements
my_list[2] = 10                    # Modify the third element

# Add elements
my_list.append(6)                  # Add an element to the end
my_list.insert(2, 7)               # Insert an element at a specific position

# Remove elements
my_list.remove(4)                  # Remove the first occurrence of an element
removed_element = my_list.pop()    # Remove and return the last element
second_element = my_list.pop(1)    # Remove and return the second element

# List length
length = len(my_list)              # Get the number of elements in the list

# Slicing
sub_list = my_list[1:4]            # Get a sublist (from index 1 to 3)
every_other_element = my_list[::2] # Get every other element

# List concatenation
another_list = [8, 9]
concatenated_list = my_list + another_list  # Concatenate two lists

# List repetition
repeated_list = my_list * 2         # Repeat the list

# Check for element existence
is_in_list = 7 in my_list           # Check if an element exists in the list

# List comprehension
squares = [x**2 for x in my_list]   # Create a new list with the squares of the elements

# Iterating through a list
for element in my_list:
    print(element)                 # Print each element

# List methods
my_list.sort()                     # Sort the list in ascending order
my_list.reverse()                  # Reverse the list
my_list.clear()                    # Remove all elements from the list

# List copying
copied_list = my_list.copy()       # Create a shallow copy of the list

# Nested lists
nested_list = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
first_sub_list = nested_list[0]    # Access the first sublist
element_in_nested_list = nested_list[1][2]  # Access an element in a sublist

# List conversion
string_list = "1,2,3,4,5"
converted_list = string_list.split(",")   # Convert a string to a list
back_to_string = ",".join(converted_list) # Convert a list to a string