lis = [2,30,'k',['qwe',20,['k',['tt',3,'1']],89],'ab','adv']

lis = [2,30,'k',['qwe',20,['k',['tt',3,'1']],89],'ab','adv']将列表lis中的tt变成大写

lis[3][2][1][0] =lis[3][2][1][0].upper()
print(lis)
lis[3][2][1][0]='TT'
print(lis)

代码如下 ，有用请点击一下采纳谢谢：

lis = [2,30,'k',['qwe',20,['k',['tt',3,'1']],89],'ab','adv']

lis[3][2][1][0] = 'TT'
print(lis)

lis = [2,30,'k',['qwe',20,['k',['tt',3,'1']],89],'ab','adv']
lis = eval(str(lis).replace('tt','TT'))
print(lis)