python中使用元组与列表的主要区别在于，元组创建后不可修改，列表在任何时刻都可以修改。
元组举例：
breakfast = ("bread,milk,tea")
print(breakfast)
输出：bread,milk,tea
注意，元组中的元素用()括起来,使用时：breakfast[0] <=>"bread"
列表举例：
sports = ["pingpong","basketball","football"] print(sports)
输出：['pingpong', 'basketball', 'football']
注意，列表中使用[]将列表中的元素括起来，使用时：sports[0] <=> "pingpong"
往列表中添加单个元素：
sports.append("run")往列表中添加多个元素或元组
sports = ["pingpong","basketball","football"]
breakfast = ("bread","milk","tea")
print(sports)
sports.extend(breakfast)
print(sports)
sports.extend(["1","2","3"]) //此处需用[]
print(sports)
输出：
['pingpong', 'basketball', 'football']
['pingpong', 'basketball', 'football', 'bread', 'milk', 'tea']
['pingpong', 'basketball', 'football', 'bread', 'milk', 'tea', '1', '2', '3']
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