Python List Method Summary

1. to add a new element ( object ) at the end of the list

L.append (object)--Append object to end

>>>l = [' Sam ', ' Shaw ', ' Stiven ']

>>>l

[' Sam ', ' Shaw ', ' Stiven ']

>>>l.append (' Alice ')

>>>l

[' Sam ', ' Shaw ', ' Stiven ', ' Alice ']

2. used to count the number of occurrences of an element in a list.

L.count (value), integer--Returnnumber of occurrences of value

>>>l = [' Sam ', ' Amy ', ' Miya ', ' Sam ']

>>>l

[' Sam ', ' Amy ', ' Miya ', ' Sam ']

>>>l.count (' Sam ')

2

>>>l.count (' Amy ')

1

3 . Used to append multiple values from another sequence at the end of the list (extending the original list with a new list)

L.extend (iterable)--Extend list byappending elements from the iterable

>>>l = [' Sam ', ' Amy ']

>>>y = [123, ' Boy ']

>>>l.extend (y)

>>>l

[' Sam ', ' Amy ', 123, ' Boy ']

4. used to find the index position of the first occurrence of a value from a list

L.index (value, [Start, [stop]])->integer--return first index of value

raises valueerror ifthe value is not present.

>>> L = [' Sam ', ' Amy ', ' Miya ']

>>> l.index (' Amy ')

1

5. To insert the specified object into the list

L.insert (Index, object)--Insert Object Beforeindex

Index-- Object Object the index location to insert

Object-- to access objects in the list

>>>l = [' Sam ', ' Amy ', ' Miya ']

>>>l.insert (2, ' Koko ')

>>>l

[' Sam ', ' Amy ', ' Koko ', ' Miya ']

6 . Used to remove an element from the list (the last element by default), and returns the value of the element

L.pop ([index]), item--Remove Andreturn item at index (default last).

Raises indexerror if List IsEmpty or index is out of range.

>>>l = [' Sam ', ' Amy ', ' Miya ', ' Sam ']

>>>l.pop ()

' Sam '

>>>l

[' Sam ', ' Amy ', ' Miya ']

>>>l.pop (1)

' Amy '

>>>l

[' Sam ', ' Miya ']

7. To remove the first occurrence of a value in a list

L.remove (value)--Remove first occurrenceof value.

raises valueerror ifthe value is not present.

>>> L = [123, ' xyz ', ' Zara ', ' abc ', ' XYZ ']

>>> l.remove (' xyz ')

>>>l

[123, ' Zara ', ' abc ', ' XYZ ']

>>>l.remove (' Shaw ')

Traceback (most recent):

File "<input>", line 1, in <module>

ValueError:list.remove (x): X not in List

8. used to reverse the elements in the list (the method does not return a value, but reverses the order of the elements of the list)

L.reverse ()--Reverse *in place*

>>>l = [' Shaw ', ' Sam ', ' Alice ']

>>>l.reverse ()

>>>l

[' Alice ', ' Sam ', ' Shaw ']

9. sort value in list (first digit, in uppercase, lowercase), if specified, use comparison function specified by comparison function

L.sort ([func])

Func-- Optional Parameters , If this parameter is specified, the method of the parameter is used to sort

>>>l = [' branch ', ' Sam ', ' Amy ']

>>>l.sort ()

>>>l

[' Amy ', ' branch ', ' Sam ']

>>>l = [8, ' branch ', ' A ', ' Sam ', ' Amy ', 6]

>>>l.sort ()

>>>l

[6,8, ' A ', ' Amy ', ' branch ', ' Sam ']

This article is from the "Shaw blog" blog, please be sure to keep this source http://opsedu.blog.51cto.com/9265055/1761216

Python List Method Summary