I recently moved from ruby to python and in ruby you could create self[nth] methods how would i do this in python?
in other words you could do this
a = myclass.new
n = 0
a[n] = 'foo'
p a[n] >> 'foo'
2 Answers
Welcome to the light side ;-)
It looks like you mean __getitem__(self, key). and __setitem__(self, key, value).
Try:
class my_class(object):
def __getitem__(self, key):
return some_value_based_upon(key) #You decide the implementation here!
def __setitem__(self, key, value):
return store_based_upon(key, value) #You decide the implementation here!
i = my_class()
i[69] = 'foo'
print i[69]
Update (following comments):
If you wish to use tuples as your key, you may consider using a dict, which has all this functionality inbuilt, viz:
>>> a = {}
>>> n = 0, 1, 2
>>> a[n] = 'foo'
>>> print a[n]
foo
5 Comments
Ryex
could this method allow for multiple dimensions? ie. i[0][3][2]
johnsyweb
Provided that the objects returned by
i[0] and i[0][3] implement __getitem__() [for getting] and __setitem__() [for setting], yes.Ryex
if i[0, 1, 2] was called would key be a tube?
johnsyweb
In this case, (0, 1, 2) as a tuple would be the key, yes. You may also consider using a
dict at this point: a = {}; a[n] = 'foo'; print a[n];
Matthew Trevor
It's also worth pointing out that you can pass slices to
__getitem__, so i[1:3:5] would pass slice(1, 3, 5) in as the key.You use __getitem__.
self[nth]meant in Ruby?