元组赋值：一种赋值语句，等号右侧用一个序列，左侧为一个变量构成的元组。
An assignment with a sequence on the right side and a tuple of variables on the left.
一个新私有变量untitled1出现在左侧的列表中。
A new private variable Untitled1 appears in the list on the left.
右侧的内容先进行运算，然后这些元素会赋值给左侧的变量。
The right side is evaluated and then its elements are assigned to the variables on the left.
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