先看一段代码:

names=['q','f']#如果列表为空 ，则只保留中扩号即可。
if names:
    for name in names:
        print(f"adding {name}.")
    print("\nfinished making your pizza!")
else:
    print("are you sure you want a plain pizza?")

输出如下：

adding q.
adding f.

finished making your pizza!

如果列表为空，则输出如下结果:

are you sure you want a plain pizza?

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