What's the difference between running a script under command box and interpreter?

[jfong at ms4.hinet.net]

Chris Angelico於 2019年11月4日星期一 UTC+8上午10時19分50秒寫道：
> On Mon, Nov 4, 2019 at 1:01 PM <jfong at ms4.hinet.net> wrote:
> >
> > Chris Angelico於 2019年11月4日星期一 UTC+8上午8時43分07秒寫道：
> > > Ah, that's a fair point. If you specifically WANT that behaviour, what
> > > you can do is invoke the script interactively:
> > >
> > > python3 -i test.py
> > >
> > > That'll run the script as normal, and then drop you into the REPL. All
> > > your interactive globals *are* that module's globals.
> > >
> > > ChrisA
> >
> > It surprises me that REPL has essential different behavior in these two situations.
> >
> 
> Not really. In each case, the REPL lets you interactively execute code
> as part of a module. If you start with "-i somescript.py", it starts
> out by running the contents of that script; otherwise, you start with
> nothing (as if you ran "-i empty-file.py"). The REPL does the same
> thing every time; it's a difference between creating the functions
> directly and importing them.
> 
> ChrisA

I mean, taking this simple example:
---test.py---
def main():
    print(rule)
if __name__ == '__main__:
    rule = 1
    main()
---

case 1:
py -i test.py
1
>>> globals()
>>> main.__globals__

case 2:
py
>>> from test import *
>>> globals()
>>> main.__globals__

The result is much different. In case 1, the REPL and the module seems in the same global space:-)

--Jach