Python: More List Methods

Because methods are so useful we are going to cover some more in this lesson!
Firstly lets create a list to use with all of the list methods:

List = ['Zero', 'One', 'Two', 'Three']

Index

The "index" method simply gives you the elements number, for example the following would output 2:

List.index('Two')

This outputs two as "Two" has been assigned the number 2.

Insert

The "Insert" method simply inserts an element just before the one you specify in the arugments, for example to add "OnePointFive" before two we could use:

List.insert(2, 'OnePointFive')

Our list is now: ['Zero', 'One', 'OnePointFive', 'Two', 'Three']

Pop

Pop is just the opposite of insert; it removes an element from the list. For example to remove "OnePointFive" we could run:

List.pop(2)

This works because "OnePointFive" has been assigned the number 2.
Our list is now back to: ['Zero', 'One', 'Two', 'Three']

Remove

Remove removes the first occurance of whatever argument you give it, for example to remove the first occurance of "Zero" we could run:

List.remove('Zero')

Reverse

This simply makes the list go backwards (it reverses the list). To change ['One', 'Two', 'Three'] to ['Three', 'Two', 'One'] we could run:

List.reverse()

Please note that reverse doesn't take any arguments.




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