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"""An example of creating, modifying, sorting, and copying lists."""

numbers: list[int] = [1, 7, 56, 2, 4] # Create the list.

print(f"The numbers are: {numbers}.") # Print the list.

print(f"is 7 in the list: {7 in numbers}") # Check if 7 is in the list.

print(f"is 2 NOT in the list: {2 not in numbers}") # the opposite check

print(f"7 ist at index {numbers.index(7)}.") # Search for number 7.

print(f"2 ist at index {numbers.index(2)}.") # Search for number 2.

numbers.insert(2, 12) # Insert the number 12 at index 2...

print(f"After inserting 12, the numbers are: {numbers}.") # and print.

numbers.remove(56) # Remove the number 56 from the list.

print(f"After removing 56, numbers are: {numbers}.") # Print the list.

numbers.sort() # Sort the list `numbers` in place.

print(f"The sorted numbers are: {numbers}.") # Print the list.

numbers.reverse() # Reverse the order of the list elements.

print(f"The reversed numbers are: {numbers}.") # And print the list.

cpy: list[int] = list(numbers) # Create a copy of the list `numbers`.

print(f"cpy == numbers: {cpy == numbers}.") # Indeed, `cpy == numbers`.

print(f"cpy is numbers: {cpy is numbers}.") # No, `cpy is not numbers`.

del cpy[0] # We change `cpy`, but `numbers` remains unchanged.

print(f"cpy == numbers: {cpy == numbers}.") # Now, `cpy != numbers`.

print(f"cpy is numbers: {cpy is numbers}.") # And `cpy is not numbers`.

print(f"cpy is not numbers: {cpy is not numbers}.") # indeed, it is not