如图,想把这个列表改成['CC','DD','EE','GG','HH','II','KK','LL','MM']请教各位大神怎么操作
a = [['cc','dd'],['aa','bb']]
b = [ i for item in a for i in item]print(b)
xx= [['cc','dd'],['aa','bb']]
yy = [ i for item in xx for i in item]print(yy)