I am trying to get a 3d list of RGB values located as text in a file and convert it to a normal list that I can use in Python.
The list on the file looks like this [[[1,0,0],[2,1,0]],[[0,1,0.5],[2,3,1.8]]].
What should I do to retrieve this list as as is, in order to use it in my code?
I tried to use functions such as split(), but I still cannot get the original list on the file because of the brackets.
Use JSON
import json
json.loads("[[[1,0,0],[2,1,0]],[[0,1,0.5],[2,3,1.8]]]")
gives you:
[[[1, 0, 0], [2, 1, 0]], [[0, 1, 0.5], [2, 3, 1.8]]]
You can parse it as JSON.
In [1]: s = "[[[1,0,0],[2,1,0]],[[0,1,0.5],[2,3,1.8]]]"
In [2]: import json
In [3]: json.loads(s)
Out[3]: [[[1, 0, 0], [2, 1, 0]], [[0, 1, 0.5], [2, 3, 1.8]]]
If you want to read it from a file:
import json
f = open("file_path", "r")
your_list = json.load(f)
You can use ast.literal_eval in this case (doc):
from ast import literal_eval
txt = '[[[1,0,0],[2,1,0]],[[0,1,0.5],[2,3,1.8]]]'
l = literal_eval(txt)
print(l)
Prints:
[[[1, 0, 0], [2, 1, 0]], [[0, 1, 0.5], [2, 3, 1.8]]]
You might want to use the ast library:
import ast
ast.literal_eval("[[[1,0,0],[2,1,0]],[[0,1,0.5],[2,3,1.8]]]")
# [[[1, 0, 0], [2, 1, 0]], [[0, 1, 0.5], [2, 3, 1.8]]]
The benefit here being literal_eval will safely parse strings into python objects, and is not limited to json-specific syntax as the json module is
