Python Data Structures #4: List Object 

thanks alot.

Two things... (1) The two instances of 'append' at 2:27 should actually be 'insert' (2) Another simple way to check if an item is in a list is by using the syntax "x in a" where 'x' is the element you wish to search for and 'a' is the list. This will return True or False, rather than the alternative .index() method shown in the video (which returns the index of the element). (3) At 4:43, valid indices range from (0, length of list -1), rather than (0, length of list). Passing length of list will result in an error because the last element of the list is at index length of list -1.

@ 10:20 there is an example for element in a: print a Which should be: for element in a: print element

Hi Brian, thanks for the videos! I have a question about the underscore you used for the iteration. You said underscore doesn't save any values. Does that mean if you try to print underscore, you will get nothing? The program is like below: for _ in range(10): print(_) I tried this and still got 1-9 printed out. So can you explain how to use underscore and under what condition we should use it? I hope I expressed myself clear and can make you understand me! Forgive my bad English! Thank you a lot!