Python中的元组与列表十分相似，元组是一种有序且不可变的序列。
创建元组
当元组中只有一个元素时，需要在元素后面加上逗号。
示例：
tup=('w','a','s','d')
_tup=(2,)
print(tup,_tup)对元组的操作
因为元组无法被改变，使用append，pop，insert是非法的。尽管如此，我们仍可以结合两个元组或删除一整个元组。
示例：
tup=('English','maths','science')
tup2=('physics','chemistry')
tup3=tup+tup2 #结合元组
print(tup3)
del tup3 #删除元组其他操作
对元组的其他操作，包括‘+’，‘*’，索引，截取与列表完全一致。
复习列表的函数
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