TypeError:尝试循环遍历Python中的函数时，不支持-的操作数类型：'str‘和'float’

def my_function():
    return "hello"

def another_function():
    return 3.14

functions = [my_function, another_function]

for func in functions:
    result = func() - 1  # 这里会引发 TypeError
    print(result)

def my_function():
    return "hello"

def another_function():
    return 3.14

functions = [my_function, another_function]

for func in functions:
    result = func()
    if isinstance(result, (int, float)):
        result -= 1
        print(result)
    else:
        print(f"Cannot perform arithmetic operation on {type(result).__name__}")