Python多维列表-如果一个值发生更改，则列中的所有值都会更改

我试图从循环中创建一个多维列表，但在为行和列输入新值时，会导致所有列值同时更改，从而只保留最后一个值。我知道这与我如何初始化列表有关，但不确定如何修复它

代码：

这将打印[[0,51,5]，[0,51,5]，[0,51,5]，[0,51,5]，[0,51,5]，[0,51,5]，[0,51,5]。

试试：

export_data=[[None for i in range(3)] for i in range(len(days))]

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创建

export\u数据时，您正在引用相同的列表
您可以通过将代码更改为

export_data = [[None]*3 for i in range(len(days))]

或者，您可以使用
zip
执行相同的操作

export_data = list(zip(days, buyorderprices, sellorderprices))
# [('Days', 'Buyorderprice', 'Sellorderprice'), (150, 10, 0), (120, 11, 1), (90, 21, 2), (60, 31, 3), (30, 41, 4), (0, 51, 5)]

或

export_data = list(zip(days, buyorderprices, sellorderprices))
# [('Days', 'Buyorderprice', 'Sellorderprice'), (150, 10, 0), (120, 11, 1), (90, 21, 2), (60, 31, 3), (30, 41, 4), (0, 51, 5)]

export_data = [list(e) for e in zip(days, buyorderprices, sellorderprices)]
# [['Days', 'Buyorderprice', 'Sellorderprice'], [150, 10, 0], [120, 11, 1], [90, 21, 2], [60, 31, 3], [30, 41, 4], [0, 51, 5]]