eith_task.py

# Create a Chainable List Class
# Objective: Implement a class `ChainableList` that supports method chaining for append, extend, and pop methods.
# Parameters:
# - None initially; the methods will handle input.
# Returns:
# - Self, after modifying the list, to support chaining.
# Details:
# - Override the `append`, `extend`, and `pop` methods to return self.
# - Ensure no method breaks the chaining by raising an exception or not returning self.

class ChainableList(list):
	pass

# Desired Outcome:
# cl = ChainableList()
# cl.append(1).extend([2, 3]).pop().append(4)  # Chain multiple operations
# print(cl)  # Expected: [1, 4]

class ChainableList(list):
    def append(self, item):
        super().append(item)
        return self

    def extend(self, items):
        super().extend(items)
        return self

    def pop(self):
        super().pop()
        return self

cl = ChainableList()
cl.append(1).extend([2, 3]).pop().append(4)
print(cl)  # The reason for getting [1, 2, 4] instead of [1, 4] is because the last element 3 is popped out, then 4 is appended, resulting in the final list being [1, 2, 4].