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There is a minor issue in your code:
F = GF(2)
R.<x> = k[]
Presumably F should be k or vice versa. The major issue with using this in Python is that R.<x> = k[] is not allowable Python syntax. Sage preparses it first. You can find out how it does this as follows:
sage: k = GF(2)
sage: preparse('R.<x> = k[]')
"R = k['x']; (x,) = R._first_ngens(1)"
So you should be able to do
from sage.all import *
k = GF(2)
R = k['x']; (x,) = R._first_ngens(1)
K = F.extension(x^4 + x + 1, 'a')
