Friday, March 11, 2011

## 6 kinds of "del" in python

(Note in most quick and dirty scripts, we seldom need to delete stuff. In other scripts, deletion is much less common than insertion.) If you are overwhelmed, just remember Most common uses are dict-delete and list-delete-by-index.

1) del myDict["some key"] # syntactically closer to List-delete than Attribute-delete

2) del myList[index] # [Note A]
2b) del myList[ sliceStart : sliceEnd ]

[A] myList.remove(someValue) is deletion by value, not by index

--------- below are more advanced (read "obscure")
3) del myVar # like java { myVar=null }. Note this is not related to
3b) __del__(self) # like dtor or java finalizer

4) del myObj.myAttr # same as
4b) __delattr__(self, myAttr) # basically remove from the idic

5) these are defined in built-in dict and list classes
__delitem__(self,index_or_key) # implements list-delete or dict-delete
__delslice__ # implements slice-delete

6) advanced Descriptor-delete
__delete__(self, instance)

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