python Named tuple to dictionary
I have a named tuple class in python
class Town(collections.namedtuple('Town', [ 'name', 'population', 'coordinates', 'population', 'capital', 'state_bird'])): # ...
What I'd like to do is turn this into a dictionary. I'll admit python is not one of my stronger languages. The key is that I dont want it to be rigidly tied to the name or numbers of the fields I have.
Is there a way to write it such that I could add more fields, or pass an entirely different named tuple in and get a dictionary.
Edit: I cant not alter the original class definition as its in someone elses code. So I need to take an instance of a Town and convert it to a dictionary.
_TL;DR: there's a method
_asdict provided for this._
Here is a demonstration of the usage:
>>> fields = ['name', 'population', 'coordinates', 'capital', 'state_bird'] >>> Town = collections.namedtuple('Town', fields) >>> funkytown = Town('funky', 300, 'somewhere', 'lipps', 'chicken') >>> funkytown._asdict() OrderedDict([('name', 'funky'), ('population', 300), ('coordinates', 'somewhere'), ('capital', 'lipps'), ('state_bird', 'chicken')])
This is a documented method of namedtuples, i.e. unlike the usual convention in python the leading underscore on the method name isn't there to discourage use. Along with the other methods added to namedtuples,
_fields, it has the underscore only to try and prevent conflicts with possible field names.
Note: For some 2.7.5 < python version < 3.5.0 code out in the wild, you might see this version:
>>> vars(funkytown) OrderedDict([('name', 'funky'), ('population', 300), ('coordinates', 'somewhere'), ('capital', 'lipps'), ('state_bird', 'chicken')])
For a while the documentation had mentioned that
_asdict was obsolete (see here), and suggested to use the built-in method vars. That advice is now outdated; in order to fix a bug related to subclassing, the
__dict__ property which was present on namedtuples has again been removed by this commit.