names=['a','b','e','f']     #顾客点配料
abcdes=['a','b','c','d']    #本店提供的配料
for name in names:          #循环
    if name in abcdes:      #如果顾客点的配料包含在提供的配料中
        print(f"adding {name}.")
    else:
        print(f"sorry,we don't have {name}.")
print("\nfinished making your pizza!")

输出结果如下：

adding a.
adding b.
sorry,we don't have e.
sorry,we don't have f.

finished making your pizza!

继续看示例：

abcds=['admin','a','b','c']
for abcd in abcds:
    if abcd=='admin':
        print (f"hello {abcd}.would you like to see a status report")
    else:
        print(f"hello {abcd},thank you for logging in again.")

输出结果：

hello admin.would you like to see a status report
hello a,thank you for logging in again.
hello b,thank you for logging in again.
hello c,thank you for logging in again.

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