# Convert a text file into a matrix

I have a file with a list of elements inside the square of a Quadratic field, i.e. `QQ(sqrt[13])^2`

. The file looks like `[[2 + sqrt[13],4 - 2*sqrt[13]],[2,sqrt[13]],...]`

. I want to import this file into a single matrix over the field, in the previous example `F.<a> = QuadraticField(13)`

. Currently, I read everything in as a string then convert to the matrix, but there must be an easier way to do this. I am somewhat new to python programming in general.