如何在python中应用切换大小写，根据变量的值返回一些值

def switch_case(variable):
    if variable == "lower":
        return "LOWER"
    elif variable == "upper":
        return "UPPER"
    else:
        return "Invalid variable value"

# 测试示例
print(switch_case("lower"))  # 输出：LOWER
print(switch_case("upper"))  # 输出：UPPER
print(switch_case("invalid"))  # 输出：Invalid variable value

def switch_case(variable):
    if variable == "lower":
        return "some value".lower()  # 将字符串转换为小写
    elif variable == "upper":
        return "some value".upper()  # 将字符串转换为大写
    else:
        return "Invalid variable value"

# 测试示例
print(switch_case("lower"))  # 输出：some value
print(switch_case("upper"))  # 输出：SOME VALUE
print(switch_case("invalid"))  # 输出：Invalid variable value