Final answer:
The output of the given Python code is error.
Step-by-step explanation:
The output of the given Python code is error. The code is assigning the output of the xx.extend(['eggs', 50]) operation to the variable y, which would be None since the extend() method modifies the original list and returns None. Therefore, when we try to access y[-1], we get an error since y is None and None does not have an index.