aty - 8 months ago 32

Python Question

What I am trying to do is extracting zeroth element in a list and first element in another list of the given 2 dimensional list.

`baseball = [[180, 78.4],`

[215, 102.7],

[210, 98.5],

[188, 75.2]]

x = [ a[0] for a in baseball ]

y = [ a[1] for a in baseball ]

print x

print y

Can this be done in a single list comprehension statement?

Answer

Assuming it's rectangular (ie. the length of the inner lists is consistent), you can implement the following:

```
def transpose(matrix):
return [[matrix[j][i] for j in range(len(matrix))] for i in range(len(matrix[0]))]
```

Then, your problem is just a call to transpose (`x, y = transpose(baseball)`

).