“Map” a nested list in Python

Question

In Python, I am trying to apply an operator to a two layer nested array. For example,

a = [[\'2.3\',\'.2\'],[\'-6.3\',\'0.9\']]
for j in range(2)
    for i in r         


        

Answer 1

The first argument requires a function, and as such, you can utilize the lambda operator to map float to the sub-lists. This is an example:

a = map(lambda b : map(float, b), a)