Also note the use of.set to initialize the value of the variable STR_SIZE to the expression following the comma.
还要注意，这里使用. set将变量str_size的值设置为逗号后面的表达式。
An expression list containing at least one comma yields a tuple. The length of the tuple is the number of expressions in the list. The expressions are evaluated from left to right.
一个表达式表是一个包括至少一个逗号的元组，它的长是表中表达式的个数。其中表达式从左到右按顺序计算。
An expression list containing at least one comma yields a tuple. The length of the tuple is the number of expressions in the list.
一个表达式表是一个包括至少一个逗号的元组，它的长是表中表达式的个数。
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