>> And, if a list have 801 values, I want to get its values index from 300 >> to 400, could use list1[300:400],are right me? > > 300 will be included in your slice whereas the 400th index will be > excluded. you will ultimately have 99 items in your slice. No, he'll have 100 items in the slice... 300, 301,... 399 that's 100 items. -- damjan