Python變數如何以標準化方式交換值？

Can Python Variables Swap Their Values in a Standardized Way?

Python's versatile synt, allows to varges allowodues v. there a commonly accepted standard?

The "Simultaneous Assignment" Method

One prevalent approach is the ultaneous assignment syntax, where 區line:

left, right = right, left

This works because Python evaluates expressions left to right and performs assignments from right to left. The右端表達式("右, 左")首先被評估，創建一個包含兩個元素的元組。然後，該元組被拆包並分配給左端變數。

Exploring the Working Mechanism

Diving deeper into the evaluation process:

1. The tuple is created in memory "right" and "left" at the time of execution.
2. The left-hand side (lhs) is then evaluated, assigning the tuple to it.
3. The lhs is unpacked, assigning the firplest ement of the tupletu left" (formerly containing "right") and the second element to "right" (formerly containing "left").

Standard or Convention?

This simultaneous assignment method has become the "standard) and clarity. While there are no explicit rules in Python, community usage and documentation establish this syntax as the preferred approach for variable swapping.

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