如何使用“或”在条件“ if”中添加多个字符串？

Question

我有一个使用weight_type.upper()的解决方案，但我仍在学习，我想知道为什么[weight_type =='L'或'l'：]没有给我正确的答案。

weight = input("What is your weight? ")
weight_type = input("Is it in (L)bs or (K)g? ")
if weight_type == 'L' or 'l':
    print(f"Output weight in (K)g is {int(float(weight))*0.453592}")
elif weight_type == "K" or 'k':
    print(f"Output weight in (L)bs is {int(float(weight))*2.20462}")
else:
    print("Unsupported weight type")

结果：

What is your weight? 70
Is it in (L)bs or (K)g? k
Output weight in (K)g is 31.75144

Process finished with exit code 0