How to compare between different compartments of a list of lists using only pure python?

Question

Say I have a list of lists [[10,2,4.8,90],[7,1,41,5],[3,11,20,2]] and another empty list of lists [[],[],[],[]].

I want to check the min value in each position in each sub-list and add it to it's concordante position in the empty list. So for example compare 10, 7 and 3. It sees that 3 is the lowest in that position, so it adds it to the first position in the empty list. The same for the other items.

For the above example, I would want something like [[3],[1],[4.8],[2]]. How can I accomplish this?

score 2 · Answer 1 · answered Jun 18 '22 at 23:54

2

Use a transpose operation, and then use min() on each row of the transposed list of lists:

[[min(row)] for row in zip(*data)]

This outputs:

[[3], [1], [4.8], [2]]

answered Jun 18 '22 at 23:54

BrokenBenchmark

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Thanks! how is it done without `zip` ? – PythonNoob Jun 19 '22 at 08:14
You can use [this answer](https://stackoverflow.com/a/6473782/17769815) instead of `zip()` + unpacking, but it's going to be more verbose. – BrokenBenchmark Jun 19 '22 at 13:39

How to compare between different compartments of a list of lists using only pure python?

1 Answers1