Use of a variable in parent loop

Sun Sep 27 07:16:54 EDT 2020

On Sun, Sep 27, 2020 at 9:01 PM Stephane Tougard via Python-list
<python-list at python.org> wrote:
>> On 2020年09月27日, 2QdxY4RzWzUUiLuE at potatochowder.com <2QdxY4RzWzUUiLuE at potatochowder.com> wrote:
> > As ChrisA noted, Python almost always Just Works without declarations.
> > If you find yourself with a lot of global and/or nonlocal statements,
> > perhaps you're [still] thinking in another language.
>>> I don't really agree with that, trying to use an undeclared
> object/variable/whatever :
>> Python 3.7.7 (default, Aug 22 2020, 17:07:43)
> [GCC 7.4.0] on netbsd9
> Type "help", "copyright", "credits" or "license" for more information.
> >>> print(name)
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> NameError: name 'name' is not defined
> >>>
>> You can say it's not the "declaration" the issue, it's the "definition",
> that's just a matter of vocabulary and it does not answer the question.
>> In many non declarative language, if I do print($var), it just prints
> and undefined value with returning an error.
>
>>> name = "Fred"
>>> print(name)
Fred
Lack of declaration doesn't imply that every variable is initialized
to some null value.
ChrisA