-2
這爲什麼會產生錯誤?爲什麼exp ** 2會產生「**」不支持的操作數類型?
>>> from math import exp
>>> exp**2
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for ** or pow(): 'builtin_function_or_method' and 'int'