不好意思 想請問以下python code:
countries = ["USA", "Canada", "India"]
countries[0], countries[1] = countries[1], countries[0]
print(countries)
Output:
['Canada', 'USA', 'India']
想請問output為什麼是這樣？
謝謝!
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試試看觀察以下的
a = 1
b = 2
a, b = b, a
a
b
因為Python有提供語法糖,無需使用暫存變數,就能做變數內容的交換.
countries = ["USA", "Canada", "India"]
countries[0], countries[1] = countries[1], countries[0]
就是把 "USA", "Canada" 做交換.
iThome鐵人賽
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