Python

data=[1,1,1,2,2,1,3,1]

print(max(set(data),key=data.count))

from operator import itemgetter

data=[[1,1,1],[3,2,1],[3,1,5]]

print(sum(map(itemgetter(-1),data)))

for s in 'HelloWorld':

    if s=='W':

        continue

      print(s,end='')

for i in range(3):

     print(2,end=',')

ls =[[1,2,3],[[4,5],6],[7,8]]

print(len(ls))