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Hi how do I import files inside a txt file?


On Mon, Sep 2, 2019 at 8:46 AM Spencer Du <spencerdu at hotmail.co.uk> wrote:
>
> On Monday, 2 September 2019 13:36:06 UTC+2, Pankaj Jangid  wrote:
> > Spencer Du <spencerdu at hotmail.co.uk> writes:
> >
> > > How do i import files inside a txt file if they exist in the current directory?
> > >
> > > Here is the current code but I dont know how to do it correctly.
> > >
> > > import paho.mqtt.client as mqtt
> > > from mqtt import *
> > > import importlib
> > > import os
> > > import os.path
> > > # from stateMachine import *
> > >
> > > with open("list_of_devices.txt", "r") as reader:
> > >     for item in reader:
> > >             try:
> > >                     os.getcwd()
> > >                     print("hi")
> > >             except:
> > >                     print("error")
> > >
> > > This is "list_of_devices.txt":
> > > test1,test2
> > >
> > > Each name refers to a python file.
> > >
> > My interpretation is that you want to read a file (list_of_devices.txt)
> > and this file contains names of other files and you want to read those
> > files as well and do something with them (read or print or whatever).
> >
> > You can approach it like this: write a function to read a file and work
> > on it. Like this,
> >
> > def fn(fname):
> >     with open(fname, "r") as f:
> >          try:
> >                 # work with f
> >          except:
> >                 print("error")
> >
> > Then use this function in your code that you have writen. Like this
> >
> > with open("list_of_devices.txt", "r") as reader:
> >      for item in reader:
> >          try:
> >                 fn(item)
> >          except:
> >                 print("error")
> >
> > In the example that you gave, you have written contents of
> > "list_of_devices.txt" as
> >
> > test1,test2
> >
> > Take care to read them as comma separated. Or if you have control then
> > write them on separate lines.
> >
> > Regards.
> > --
> > Pankaj Jangid
>
> Hi Pankaj
>
> I dont understand so what is complete code then?
>
> Thanks
> Spencer
> --
> https://mail.python.org/mailman/listinfo/python-list

Pardon me for guessing, but your question seems to imply that you know
how you want to do something .. but I'm not sure you have tackled your
problem correctly.

My guess is:  Depending upon the names listed in a text file, you want
to do different imports into your program.   You don't yet know how to
read a file with python.

First, when you run your program, python compiles it in order.  Since
you don't know what you want to import until after you run your
program, you can't import those modules.  You may be able to run a
program to read the module list, then have it output to a new file the
code you eventually want to run based on the modules you discovered.
That sounds cute in a way, but probably not in a good way.  You could
also surround import statements with try/except code that will import
what it can, and alert you when it can't

Can you give us the bigger picture of what you want to accomplish?
This might lead to a better solution than the one you are thinking of
now

-- 
Joel Goldstick
http://joelgoldstick.com/blog
http://cc-baseballstats.info/stats/birthdays