On Sat, 14 Sep 2019 at 03:40, Random832 <random...@fastmail.com> wrote: > On Fri, Sep 13, 2019, at 21:22, Hongyi Zhao wrote: > > what's the differences: None and null? > null isn't really a concept that exists in Python...
I'd say the opposite, according to [1] "None" is just the name of the null object. [1]: https://docs.python.org/3/library/stdtypes.html?highlight=null#the-null-object -- Andrea On Sat, 14 Sep 2019 at 03:40, Random832 <random...@fastmail.com> wrote: > > On Fri, Sep 13, 2019, at 21:22, Hongyi Zhao wrote: > > what's the differences: None and null? > > null isn't really a concept that exists in Python... while None fills many of > the same roles that null does in some other languages, it is a proper object, > with __str__ and __repr__ methods (that return 'None'), __hash__ (that > returns an arbitrary value), etc. > > NULL, the C/C++ null pointer, is used in CPython for things like error > returns, things like slots or cell variables that are not initialized (as > opposed to being set to None), etc. This is an implementation detail, and > should never come up in Python code. > -- > https://mail.python.org/mailman/listinfo/python-list -- Andrea -- https://mail.python.org/mailman/listinfo/python-list
