The Del, Remove,pop difference of the python array

Take a=[1,2,3] For example, it seems to use Del, remove, pop an element 2 after a is all for [1,3], as follows:

2. >>> a=[1,2,3]
4. >>> A.remove (2)
6. >>> A
8. [1, 3]
10. >>> a=[1,2,3]
12. >>> del a[1]
14. >>> A
16. [1, 3]
18. >>> a= [1,2,3]
20. >>> A.pop (1)
22. 2
24. >>> A
26. [1, 3]
28. >>>

So what's the difference between Python and the list del, remove, and pop operations?

First, remove is the first element that meets the criteria. Does not delete a specific index. The following example: This article from the Novell fan website http://novell.me

1. >>> a = [0, 2, 2, 3]
2. >>> A.remove (2)
3. >>> A
4. [0, 2, 3]

For Del, it is deleted based on the index (where the element is), as in the following example:

1. >>> a = [3, 2, 2, 1]
2. >>> del a[1]
3. [3, 2, 1]

The 1th element is a[0]--is counted starting at 0. Then a[1] refers to the 2nd element, which is the value 2.

Finally, we'll look at POPs.

1. >>> a = [4, 3, 5]
2. >>> A.pop (1)
3. 3
4. >>> A
5. [4, 5]

Pop returns the value that you popped.

So use the appropriate method according to your specific needs. content from Http://novell.me

In addition, if they go wrong, the error mode is different. Note the following differences:

2. >>> a = [4, 5, 6]
4. >>> A.remove (7)
6. Traceback (most recent):
8. File "<stdin>", line 1, in <module>
10. ValueError:list.remove (x): X not in list
12. >>> del a[7]
14. Traceback (most recent):
16. File "<stdin>", line 1, in <module>
18. Indexerror:list Assignment index out of range
20. >>> A.pop (7)
22. Traceback (most recent):
24. File "<stdin>", line 1, in <module>
26. Indexerror:pop index out of range

The Del, Remove,pop difference of the python array