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。
When it comes to commas, 44.9% favor to place them after an expression, while 4.9% prefer to use comma-first syntax.
逗号方面，44.9% 的开发者喜欢将逗号放在表达式的末尾，然而有4.9% 的开发者喜欢先写逗号。
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