- Lists are very similar to arrays. They can contain any type of variable, and they can contain as many variables as you wish. Lists can also be iterated over in a very simple manner.
- Operations you can perform on lists:
- append : add element in the end of the list
- delete : delete any specified element from the list
- len : count the number of elements in the list
- insert : can add a new element at any place in the list, not only at the end
- It may look strange, but negative indices are legal, and can be very useful.
- An element with an index equal to
-1is the last one in the list. - An element with an index equal to
-2is the one before last in the list. - Refer q4.py
- This is the traditional method you can use :
- Python offers a more convenient way of doing the swap – take a look:
- you can easily swap the list's elements to reverse their order:
- When you assign one list to another, such as list_2 = list_1, you are not creating a new copy of the list. Instead, you are creating a new reference to the same list in memory.
- A slice is an element of Python syntax that allows you to make a brand new copy of a list, or parts of a list.
- It actually copies the list's contents, not the list's name.
- This inconspicuous part of the code described as [:] is able to produce a brand new list.
- refer q8.py
One of the most general forms of the slice looks as follows:
Deleting all the elements at once is possible too:
Removing the slice from the code changes its meaning dramatically. Take a look:
- Python offers two very powerful operators, able to look through the list in order to check whether a specific value is stored inside the list or not.
