Checkpoint 9.5.1.
- True
- Yes, 3.14 is an item in the list
a_list. - False
- There are six items in the list; 3.14 is one of them.
What is printed by the following statements?
a_list = [3, 67, "cat", 910.0, 3.14, False]
print(3.14 in a_list)
Section 9.5 List Membership
in and not in are boolean operators that test membership in a sequence. We used them previously with strings and they also work here.If you want to know where something is in a list, you can use the
.index() function. It will return the index where the item is in the list—but if the item is not in the list, it will generate a ValueError.However, we can use the
in operator to make a function that gives us a “safe” index:Because our
safe_index function isn’t built in to the list class, we cannot use it with dot notation.
