python - 多維列表內一部分字串型轉換為整數

Question

shell.txt
a1 b1 0.2 0
a1 c1 0.8 0
b1 c1 0.7 0
a2 b2 1 0
a2 d2 0.4 0
d2 b2 0.6 0
a2 d2 0.4 0
d2 b2 0.6 0
#a1 a2 1 1
a2 a1 0.1 1

b1 b2 0.5 1

b2 b1 0 1

with open('shell.txt') as f:
    lines = f.readlines()
mylist = [line.strip().split() for line in lines]

###由於txt資料載入後皆為字串型，現需講後兩列轉換為整數，求大佬給些clean的方法，謝謝###

Answer 1

雷雷