Peter Otten writes: > Thomas Jollans wrote: > >> On 04/06/17 09:52, Rustom Mody wrote: >>> On Sunday, June 4, 2017 at 12:45:23 AM UTC+5:30, Jon Forrest wrote: >>>> I'm learning about Python. A book I'm reading about it >>>> says "... a string in Python is a sequence. A sequence is an ordered >>>> collection of objects". This implies that each character in a string >>>> is itself an object. >>>> >>>> This doesn't seem right to me, but since I'm just learning Python >>>> I questioned the author about this. He gave an example the displays >>>> the ids of string slices. These ids are all different, but I think >>>> that's because the slicing operation creates objects. >>>> >>>> I'd like to suggest an explanation of what a sequence is >>>> that doesn't use the word 'object' because an object has >>>> a specific meaning in Python. >>>> >>>> Am I on the right track here? >>> >>> Its a good sign that you are confused >>> If you were not (feeling) confused, it would mean you are actually more >>> so… Following is not exactly what you are disturbed by... Still closely >>> related >>> >>>>>> s="a string" >>>>>> s[0] >>> 'a' >>>>>> s[0][0] >>> 'a' >>>>>> s[0][0][0][0][0] >>> 'a' >> >> Also: >> >>>>> s[0] is s[0][0][0][0][0][0][0] >> True >>>>> > > However, this is an implementation detail: > >>>> def is_cached(c): > ... return c[0] is c[0][0] > ...
I think this works the same, and looks more dramatic to me: ... return c[0] is c[0] >>>> is_cached(chr(255)) > True >>>> is_cached(chr(256)) > False Also same thing, as far as I can see: >>> s = "\u00ff\u0100" ; (s[0] is s[0], s[1] is s[1]) (True, False) -- https://mail.python.org/mailman/listinfo/python-list
