具有多索引的熊猫中的自定义排序顺序

Question

I have a dataset with multiindex, where level 0 is the following:

['-67', '67', '-68', '68']

when importing the data through a java interface, the data loads in this order:

['-67', '-68', '67', '68']

I plan on appending the timestamps from each level 0 index, so having them in the correct order is important. The correct order is:

['-##', '##', .....] for as many level 0 datasets are being analyzed.

This also needs to be a generic solution, as it will involve many datasets.

I've looked at the solutions for custom sorting, but nothing provided a generic solution.

Answer 1

You can using sorted with key and lambda

sorted(['-67', '-68', '67', '68'],key= lambda x : abs(int(x)))
Out[882]: ['-67', '67', '-68', '68']

Answer 2

如果要确保负数出现在正数之前，可以执行以下操作：

sorted(list_name, key = lambda x : (abs(int(x), int(x) > 0)))