This is 0 for numeric types, the empty string('') for string types, and the“zero” value for date and time types.".
所有数字类型(复数除外)都支持下列运算,按优先级升序排序(所有数字运算的优先级都高于比较运算).
All numeric types(except complex) support the following operations, sorted by ascending priority(all numeric operations have a higher priority than comparison operations).
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