Trying to understand a very simple class - from the book "dive into python"
davea at ieee.org
Wed May 20 23:35:53 EDT 2009
> Example 5.6. Coding the FileInfo Class
> class FileInfo(UserDict):
> "store file metadata"
> def __init__(self, filename=ne):
> UserDict.__init__(self) (1)
> self["name"] =ilename (2)
> What I do not understand is the last line. I thought 'self' was
> supposed to refer to an instance of the object. But the square
> brackets seem to indicate a list. Except you can not assign values to
> a list like that. So where does "name" come from?
> I am sure this is totally simple, but I missing something.
You're deriving your class from UserDict, which is a "Class that
simulates a dictionary." So you can use dictionary semantics on
"self." "name" is a key for the dict.
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