insert data in python script

[alberto]

Il giorno martedì 18 febbraio 2020 09:34:51 UTC+1, DL Neil ha scritto:
> ...
> 
> >> import preos
> >> # pass name, Tc, Pc, omega
> >> methane = preos.Molecule("methane", -82.59 + 273.15, 45.99, 0.011)
> >> methane.print_params()
> 
> ...
> 
> > my code preos in one file preos.py
> > my commands are
> > 
> > alberto at HENDRIX ~/PREOS $ python3.5
> > Python 3.5.2 (default, Oct  8 2019, 13:06:37)
> > [GCC 5.4.0 20160609] on linux
> > Type "help", "copyright", "credits" or "license" for more information.
> >>>> import preos
> >>>> methane = Molecule("methane", -82.59 + 273.15, 45.99, 0.011)
> > Traceback (most recent call last):
> >    File "<stdin>", line 1, in <module>
> > NameError: name 'Molecule' is not defined
> 
> 
> The first instruction (immediately above) imports the module preos.py. 
> That works (no error message!).
> 
> The second instruction refers to a Python class called Molecule. That 
> fails. The error message says that 'Molecule' is not defined.
> 
> Yet we can 'see' it. It *has* been defined! What is going on???
> 
> In this case, we need to tell Python that Molecule is part of the preos 
> module. So back to your original code (top):
> 
> methane = preos.Molecule("methane", -82.59 + 273.15, 45.99, 0.011)
> 
> 
> Please refer to earlier message. If Module were called from code in the 
> preos.py file, then the "preos." prefix would not be necessary.
> 
> The formal term for this situation is "namespaces". Because Molecule is 
> defined within the preos.py module's namespace we need to tell Python 
> exactly where Molecule can be found. In the same way that we might say: 
> if someone in Antarctica wants to see Alberto, (s)he will have to go to 
> Italy to find him...
> 
> 
> Don't hesitate to say if you think my reply is too complicated/advanced. 
> People here are happy to help...
> -- 
> Regards =dn

hi
honestly i don't understand what i have to do.
I have been using python for too little time.
could you help me understand

regards 

Alberto