字典

pairs = {1: "apple",
  "orange": [2, 3, 4], 
  True: False, 
  None: "True",
}

print(pairs.get("orange"))
print(pairs.get(7))
print(pairs.get(12345, "不在字典中") 

>>>
[2, 3, 4]
None
不在字典中
>>>