Solution 1:
You can do it like this:
list_samp = [['1','2','blue'],['1','66','green'],['1','88','purple']]
me = [[int(u) if u.isdecimal() else u for u in v] for v in list_samp]
print(me)
You can do it like this:
list_samp = [['1','2','blue'],['1','66','green'],['1','88','purple']]
me = [[int(u) if u.isdecimal() else u for u in v] for v in list_samp]
print(me)