Biotechgeek - 6 months ago 38

Python Question

I have

`q = [[7,2,3],[4,5,6]]`

`r=[[6,1,2],[3,4,5]]`

`[[7/6,2/1,3/2],[4/3,5/4,6/5]]`

Output needed B = [[1.16,2,1.5],[1.33,1.25,1.2]]

Code:

`B= [[float(j)/float(i) for j in q] for i in r]`

However, I keep getting an error : TypeError: float() argument must be a string or a number. I have imported division from future. Any suggestions?

Answer

Use *zip* for bring together the sublists pairwise and then use it again to bring together the corresponding numerators and denominators:

```
>>> q = [[7,2,3],[4,5,6]]
>>> r = [[6,1,2],[3,4,5]]
>>> [[n/d for n, d in zip(subq, subr)] for subq, subr in zip(q, r)]
[[1.1666666666666667, 2.0, 1.5], [1.3333333333333333, 1.25, 1.2]]
```